Wireless randomly disconnects from time to time

/====================\
|=== WHEN WORKING ===|
\====================/
yharooer@bentley-u300s:~$ sudo iwlist scan
wlan0     Scan completed :
          Cell 01 - Address: E4:F4:C6:00:AD:BC
                    Channel:13
                    Frequency:2.472 GHz (Channel 13)
                    Quality=64/70  Signal level=-46 dBm
                    Encryption key:on
                    ESSID:"wireless"
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
                              24 Mb/s; 36 Mb/s; 54 Mb/s
                    Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 48 Mb/s
                    Mode:Master
                    Extra:tsf=000000a256b29fc5
                    Extra: Last beacon: 28ms ago
                    IE: Unknown: 0008776972656C657373
                    IE: Unknown: 010882840B162430486C
                    IE: Unknown: 03010D
                    IE: Unknown: 2A0104
                    IE: Unknown: 2F0104
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : CCMP
                        Pairwise Ciphers (1) : CCMP
                        Authentication Suites (1) : PSK
                    IE: Unknown: 32040C121860
                    IE: Unknown: 0B050E00180000
                    IE: Unknown: 2D1AAD1917FFFFFF0000000000000000000000000000000000000000
                    IE: Unknown: 3D160D081500000000000000000000000000000000000000
                    IE: Unknown: 4A0E14000A002C01C800140005001900
                    IE: Unknown: 7F080500080000000040
                    IE: Unknown: DD7A0050F204104A0001101044000102103B000103104700107A41E4AF8464CEF5C5270E2C10BC6A791021000D4E4554474541522C20496E632E1023000552373030301024000552373030301042000233321054000800060050F2040001101100055237303030100800022008103C0001031049000600372A000120
                    IE: Unknown: DD09001018020E001C0000
                    IE: Unknown: DD180050F2020101880003A4000027A400004243BC0062326600
                    IE: Unknown: 46057200010000
                    IE: Unknown: DD1E00904C0408BF0CB259820FEAFF0000EAFF0000C005000D000000C3020002
          Cell 02 - Address: 00:26:F2:D5:63:77
                    Channel:6
                    Frequency:2.437 GHz (Channel 6)
                    Quality=32/70  Signal level=-78 dBm
                    Encryption key:on
                    ESSID:"BigPond1CAA"
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
                              24 Mb/s; 36 Mb/s; 54 Mb/s
                    Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 48 Mb/s
                    Mode:Master
                    Extra:tsf=00000007d318d1f6
                    Extra: Last beacon: 28ms ago
                    IE: Unknown: 000B426967506F6E6431434141
                    IE: Unknown: 010882848B962430486C
                    IE: Unknown: 030106
                    IE: Unknown: 2A0100
                    IE: Unknown: 2F0100
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : CCMP TKIP
                        Authentication Suites (1) : PSK
                    IE: Unknown: 32040C121860
                    IE: Unknown: 2D1A7C181BFFFF000000000000000000000000000000000000000000
                    IE: Unknown: 3D1606080400000000000000000000000000000000000000
                    IE: Unknown: DD700050F204104A0001101044000102103B000103104700104D73C5C27E6B5243D6440AAB1719670B102100074E657467656172102300074E6574676561721024000631323334353610420007303030303030311054000800060050F20400011011000843474432344E4150100800020088
                    IE: Unknown: DD090010180201F0050000
                    IE: WPA Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : CCMP TKIP
                        Authentication Suites (1) : PSK
                    IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00
                    IE: Unknown: DD1E00904C337C181BFFFF000000000000000000000000000000000000000000
                    IE: Unknown: DD1A00904C3406080400000000000000000000000000000000000000
          Cell 03 - Address: C4:34:6B:0D:09:C8
                    Channel:13
                    Frequency:2.472 GHz (Channel 13)
                    Quality=58/70  Signal level=-52 dBm
                    Encryption key:off
                    ESSID:"HP-Print-C8-Officejet Pro 8620"
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 6 Mb/s; 9 Mb/s
                              11 Mb/s; 12 Mb/s; 18 Mb/s
                    Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
                    Mode:Master
                    Extra:tsf=000000a256c65238
                    Extra: Last beacon: 28ms ago
                    IE: Unknown: 001E48502D5072696E742D43382D4F66666963656A65742050726F2038363230
                    IE: Unknown: 010802040B0C12161824
                    IE: Unknown: 03010D
                    IE: Unknown: 2A0100
                    IE: Unknown: 32043048606C
                    IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00
                    IE: Unknown: DD890800090004000000070102010002017803284850204F66666963656A65742050726F203836323000000000000000000000000000000000000000040F38363230000000000000000F434E340510434E343934443431433600000000000006101C852A4DB8001F08ABCDA02BB8671D3A0704C0A80109080200D4090200080A04000000010B0400000000

virbr0    Interface doesn't support scanning.

lo        Interface doesn't support scanning.

yharooer@bentley-u300s:~$ iwconfig
wlan0     IEEE 802.11bgn  ESSID:"wireless"
          Mode:Managed  Frequency:2.472 GHz  Access Point: E4:F4:C6:00:AD:BC
          Bit Rate=65 Mb/s   Tx-Power=15 dBm
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=59/70  Signal level=-51 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:3  Invalid misc:101   Missed beacon:0

virbr0    no wireless extensions.

lo        no wireless extensions.

yharooer@bentley-u300s:~$ iwconfig
wlan0     IEEE 802.11bgn  ESSID:"wireless"
          Mode:Managed  Frequency:2.472 GHz  Access Point: E4:F4:C6:00:AD:BC
          Bit Rate=72.2 Mb/s   Tx-Power=15 dBm
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=60/70  Signal level=-50 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:3  Invalid misc:101   Missed beacon:0

virbr0    no wireless extensions.

lo        no wireless extensions.

yharooer@bentley-u300s:~$ lsmod
Module                  Size  Used by
xt_CHECKSUM            12549  1
iptable_mangle         12695  1
ipt_MASQUERADE         12880  3
iptable_nat            12970  1
nf_nat_ipv4            13263  1 iptable_nat
nf_nat                 26148  3 ipt_MASQUERADE,nf_nat_ipv4,iptable_nat
nf_conntrack_ipv4      14806  2
nf_defrag_ipv4         12758  1 nf_conntrack_ipv4
xt_conntrack           12760  1
nf_conntrack          105044  6 ipt_MASQUERADE,nf_nat,nf_nat_ipv4,xt_conntrack,iptable_nat,nf_conntrack_ipv4
ipt_REJECT             12541  2
xt_tcpudp              12884  6
iptable_filter         12810  1
ip_tables              27240  3 iptable_filter,iptable_mangle,iptable_nat
x_tables               34052  8 xt_CHECKSUM,ip_tables,xt_tcpudp,ipt_MASQUERADE,xt_conntrack,iptable_filter,ipt_REJECT,iptable_mangle
bridge                116134  0
stp                    12976  1 bridge
llc                    14396  2 stp,bridge
ctr                    13049  2
ccm                    17731  2
bnep                   19543  2
rfcomm                 69509  8
binfmt_misc            17468  1
btusb                  32448  0
bluetooth             446190  22 bnep,btusb,rfcomm
snd_hda_codec_hdmi     47547  1
6lowpan_iphc           18702  1 bluetooth
snd_hda_codec_conexant    23064  1
snd_hda_codec_generic    68914  1 snd_hda_codec_conexant
uvcvideo               81065  0
videobuf2_vmalloc      13216  1 uvcvideo
videobuf2_memops       13362  1 videobuf2_vmalloc
videobuf2_core         59104  1 uvcvideo
v4l2_common            15682  1 videobuf2_core
videodev              149725  3 uvcvideo,v4l2_common,videobuf2_core
media                  21963  2 uvcvideo,videodev
intel_rapl             18783  0
x86_pkg_temp_thermal    14205  0
arc4                   12608  2
intel_powerclamp       18786  0
coretemp               13441  0
iwldvm                236430  0
hid_generic            12559  0
kvm_intel             143592  0
mac80211              660592  1 iwldvm
kvm                   459835  1 kvm_intel
snd_hda_intel          30420  4
usbhid                 52566  0
snd_hda_controller     35152  1 snd_hda_intel
hid                   110426  2 hid_generic,usbhid
snd_hda_codec         139675  5 snd_hda_codec_hdmi,snd_hda_codec_conexant,snd_hda_codec_generic,snd_hda_intel,snd_hda_controller
crct10dif_pclmul       14307  0
snd_hwdep              17698  1 snd_hda_codec
crc32_pclmul           13133  0
snd_pcm               104102  5 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel,snd_hda_controller
ghash_clmulni_intel    13230  0
aesni_intel           152552  5
aes_x86_64             17131  1 aesni_intel
snd_seq_midi           13564  0
iwlwifi               183038  1 iwldvm
i915                  917748  4
snd_seq_midi_event     14899  1 snd_seq_midi
lrw                    13287  1 aesni_intel
gf128mul               14951  1 lrw
snd_rawmidi            30876  1 snd_seq_midi
glue_helper            13944  1 aesni_intel
ablk_helper            13597  1 aesni_intel
snd_seq                67224  2 snd_seq_midi_event,snd_seq_midi
dm_multipath           22843  0
cfg80211              510218  3 iwlwifi,mac80211,iwldvm
cryptd                 20360  3 ghash_clmulni_intel,aesni_intel,ablk_helper
snd_seq_device         14497  3 snd_seq,snd_rawmidi,snd_seq_midi
scsi_dh                14882  1 dm_multipath
snd_timer              29513  2 snd_pcm,snd_seq
joydev                 17344  0
snd                    87611  18 snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_hda_codec_conexant,snd_pcm,snd_seq,snd_rawmidi,snd_hda_codec_generic,snd_hda_codec,snd_hda_intel,snd_seq_device
drm_kms_helper         61627  1 i915
serio_raw              13434  0
drm                   310919  6 i915,drm_kms_helper
shpchp                 37040  0
soundcore              15052  2 snd,snd_hda_codec
i2c_algo_bit           13406  1 i915
ideapad_laptop         18278  0
mei_me                 19742  0
wmi                    19193  0
lpc_ich                21093  0
mei                    87931  1 mei_me
video                  20128  1 i915
parport_pc             32741  0
sparse_keymap          13948  1 ideapad_laptop
mac_hid                13227  0
ppdev                  17671  0
lp                     17759  0
parport                42299  3 lp,ppdev,parport_pc
psmouse               106593  0
ahci                   34062  3
libahci                32424  1 ahci

yharooer@bentley-u300s:~$ lsusb
Bus 002 Device 003: ID 8086:0189 Intel Corp.
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 002: ID 045e:0773 Microsoft Corp.
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 174f:1439 Syntek
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

/=========================\
|=== ONCE DISCONNECTED ===|
\=========================/
yharooer@bentley-u300s:~$ sudo iwlist scan
wlan0     Interface doesn't support scanning : Network is down

virbr0    Interface doesn't support scanning.

lo        Interface doesn't support scanning.

yharooer@bentley-u300s:~$ iwconfig
wlan0     IEEE 802.11bgn  ESSID:off/any
          Mode:Managed  Access Point: Not-Associated   Tx-Power=15 dBm
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:off

virbr0    no wireless extensions.

lo        no wireless extensions.

yharooer@bentley-u300s:~$ lsmod
Module                  Size  Used by
ctr                    13049  0
ccm                    17731  0
xt_CHECKSUM            12549  1
iptable_mangle         12695  1
ipt_MASQUERADE         12880  3
iptable_nat            12970  1
nf_nat_ipv4            13263  1 iptable_nat
nf_nat                 26148  3 ipt_MASQUERADE,nf_nat_ipv4,iptable_nat
nf_conntrack_ipv4      14806  2
nf_defrag_ipv4         12758  1 nf_conntrack_ipv4
xt_conntrack           12760  1
nf_conntrack          105044  6 ipt_MASQUERADE,nf_nat,nf_nat_ipv4,xt_conntrack,iptable_nat,nf_conntrack_ipv4
ipt_REJECT             12541  2
xt_tcpudp              12884  6
iptable_filter         12810  1
ip_tables              27240  3 iptable_filter,iptable_mangle,iptable_nat
x_tables               34052  8 xt_CHECKSUM,ip_tables,xt_tcpudp,ipt_MASQUERADE,xt_conntrack,iptable_filter,ipt_REJECT,iptable_mangle
bridge                116134  0
stp                    12976  1 bridge
llc                    14396  2 stp,bridge
rfcomm                 69509  8
bnep                   19543  2
binfmt_misc            17468  1
snd_hda_codec_hdmi     47547  1
snd_hda_codec_conexant    23064  1
snd_hda_codec_generic    68914  1 snd_hda_codec_conexant
arc4                   12608  2
intel_rapl             18783  0
uvcvideo               81065  0
iwldvm                236430  0
x86_pkg_temp_thermal    14205  0
intel_powerclamp       18786  0
videobuf2_vmalloc      13216  1 uvcvideo
coretemp               13441  0
mac80211              660592  1 iwldvm
videobuf2_memops       13362  1 videobuf2_vmalloc
videobuf2_core         59104  1 uvcvideo
v4l2_common            15682  1 videobuf2_core
kvm_intel             143592  0
videodev              149725  3 uvcvideo,v4l2_common,videobuf2_core
kvm                   459835  1 kvm_intel
media                  21963  2 uvcvideo,videodev
snd_hda_intel          30420  5
snd_hda_controller     35152  1 snd_hda_intel
snd_hda_codec         139675  5 snd_hda_codec_hdmi,snd_hda_codec_conexant,snd_hda_codec_generic,snd_hda_intel,snd_hda_controller
crct10dif_pclmul       14307  0
snd_hwdep              17698  1 snd_hda_codec
crc32_pclmul           13133  0
snd_pcm               104102  5 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel,snd_hda_controller
ghash_clmulni_intel    13230  0
i915                  917748  5
aesni_intel           152552  0
iwlwifi               183038  1 iwldvm
aes_x86_64             17131  1 aesni_intel
lrw                    13287  1 aesni_intel
snd_seq_midi           13564  0
gf128mul               14951  1 lrw
snd_seq_midi_event     14899  1 snd_seq_midi
glue_helper            13944  1 aesni_intel
dm_multipath           22843  0
snd_rawmidi            30876  1 snd_seq_midi
ablk_helper            13597  1 aesni_intel
cryptd                 20360  3 ghash_clmulni_intel,aesni_intel,ablk_helper
scsi_dh                14882  1 dm_multipath
snd_seq                67224  2 snd_seq_midi_event,snd_seq_midi
cfg80211              510218  3 iwlwifi,mac80211,iwldvm
snd_seq_device         14497  3 snd_seq,snd_rawmidi,snd_seq_midi
snd_timer              29513  2 snd_pcm,snd_seq
drm_kms_helper         61627  1 i915
btusb                  32448  0
drm                   310919  7 i915,drm_kms_helper
joydev                 17344  0
snd                    87611  20 snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_hda_codec_conexant,snd_pcm,snd_seq,snd_rawmidi,snd_hda_codec_generic,snd_hda_codec,snd_hda_intel,snd_seq_device
wmi                    19193  0
bluetooth             446190  22 bnep,btusb,rfcomm
ideapad_laptop         18278  0
shpchp                 37040  0
serio_raw              13434  0
i2c_algo_bit           13406  1 i915
lpc_ich                21093  0
soundcore              15052  2 snd,snd_hda_codec
mei_me                 19742  0
mei                    87931  1 mei_me
6lowpan_iphc           18702  1 bluetooth
sparse_keymap          13948  1 ideapad_laptop
video                  20128  1 i915
parport_pc             32741  0
mac_hid                13227  0
ppdev                  17671  0
lp                     17759  0
parport                42299  3 lp,ppdev,parport_pc
hid_generic            12559  0
usbhid                 52566  0
hid                   110426  2 hid_generic,usbhid
ahci                   34062  3
psmouse               106593  0
libahci                32424  1 ahci

yharooer@bentley-u300s:~$ lsusb
Bus 002 Device 003: ID 8086:0189 Intel Corp.
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 002: ID 045e:0773 Microsoft Corp.
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 174f:1439 Syntek
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub