Hi DTSM,

Back with a report for you.

0.5.4: Unstable but worked at least 6-8h before an error. Lost 20 Sol/s each on my 1080ti's.
0.5.5: Instant crash between 5 seconds and 30mins. Lost over 80 Sol/s each on my 1080ti's. Very unstable and not worth using (could be the windows update causing problems).

0.5.6: Sol/s is back up running 725-740! (Like before). Vey low temperature again and no errors, no cuda problems, very stable and everything is working fine again.

Summary: I don't know what you did but everything is working fine for me again. Thank you DTSM. More efficiency on  1080ti's would be lovely. Keep you the good work!