Dotachin, I am having this exact problem and it wiped out 4 of my 6-GPU rigs just now, which is killing my effective hashrate. I'm also on NiceHash like you. Does updating to 11.2 fix it? In which case I'll move all rigs to that now - most of mine are on 10.2 and 11.0.
Looks like so, but there was only 1 such case since i've moved to 11.2 (some rigs with 2GB RAM still runs 10.2, so i can compare).
Claymore, can it be easily done to return compatibility with 2GB RAM? Currently 11.x gives half of hashrate on such builds while 10.2 ran at full speed