setup:
NXT client (running normal mode, not compatibility since it behaves slower)
Win 10 64-bit (latest updates)
8Gb Ram (never running out of it while playing rs)
1+1 TB hard drive
gtx 660 (with the latest driver, 372.70)
i5 3470

where this error appears: It only seems to appear when barbarian fishing at Otto's grotto, around 1-2 times per hour. I often see people that were fishing with me getting the error at the same time (reconnecting later and, upon asking them what happened they tell me about the exact same error), they all seem to have NXT client as well.

What have I tried:
 - reinstalling the nxt client
 - making a clean install of the gpu drivers
 - updating windows
 - slightly lowering settings and assigning more memory to rs (page file memory, in case it ever runs out, somehow)

picture of the error code: http://i.imgur.com/9fWz4GE.png ; error code: "the instruction at 0x%p referenced the memory at 0x%p. The memory could not be %s. (c0000005)"

I'm open to any suggestions on what to try, I'll provide more info about anything specific if it's requested.