Sometimes my entire screen will turn green requiring a reboot. This has happened while gaming but also while watching videos in browser. I'm trying out undervolting/underclocking using LACTL. Have you experienced this? What was the cause and how did you fix it?
Seems to be a common issue. Lots of posts point to the PSU as the issue. Do a search on your card and green screen + linux and see all the results. Good luck.