Same here as well. Gpu 1 incorrect data. 7970. Finally pulled the card and put in a 390x. All is well. Funny was that after running v12. That 7970 does same now on v11.1. Think it wiped out my card.  Def some bugs in the new release. Save yourself some headaches and move to v11.1 if you can't get stability. At least it will run more than a few hours.  Also same rig when it would drop to 0 hash on a different random card before replacing 7970 it would start getting socket errors. Then pc was no longer accessible via team viewer. Had to manually reboot Computer. Great effort claymore. I am getting over 400 sols on 390x. Those seem to have no issues running v12.

BR