regarding USB randomly stopping

# when re-plugging a USB device works OK, I see this in the output from "journalctl -fa"

Jan 03 12:27:48 elitebook-mageia5.home kernel: usb 2-4: new full-speed USB device number 3 using xhci_hcd
Jan 03 12:27:48 elitebook-mageia5.home kernel: usb 2-4: New USB device found, idVendor=046d, idProduct=c534
Jan 03 12:27:48 elitebook-mageia5.home kernel: usb 2-4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
Jan 03 12:27:48 elitebook-mageia5.home kernel: usb 2-4: Product: USB Receiver
Jan 03 12:27:48 elitebook-mageia5.home kernel: usb 2-4: Manufacturer: Logitech
Jan 03 12:27:48 elitebook-mageia5.home mtp-probe[28687]: checking bus 2, device 3: "/sys/devices/pci0000:00/0000:00:14.0/usb2/2-4"
Jan 03 12:27:48 elitebook-mageia5.home mtp-probe[28687]: bus: 2, device: 3 was not an MTP device
Jan 03 12:27:48 elitebook-mageia5.home kernel: input: Logitech USB Receiver as /devices/pci0000:00/0000:00:14.0/usb2/2-4/2-4:1.0/0003:046D:C534.0001/input/input24
Jan 03 12:27:48 elitebook-mageia5.home colord-sane[28689]: io/hpmud/pp.c 627: unable to read device-id ret=-1
Jan 03 12:27:48 elitebook-mageia5.home kernel: hid-generic 0003:046D:C534.0001: input,hidraw0: USB HID v1.11 Keyboard [Logitech USB Receiver] on usb-0000:00:14.0-4/input0
Jan 03 12:27:48 elitebook-mageia5.home kernel: input: Logitech USB Receiver as /devices/pci0000:00/0000:00:14.0/usb2/2-4/2-4:1.1/0003:046D:C534.0002/input/input25
Jan 03 12:27:48 elitebook-mageia5.home kernel: hid-generic 0003:046D:C534.0002: input,hiddev0,hidraw1: USB HID v1.11 Mouse [Logitech USB Receiver] on usb-0000:00:14.0-4/input1