I have the same issue using 3.1 since it launched, never bothered to find out why, nor filed anything in the issue tracker, I just turn the computer off and on again.
My screen blacks out, I can move the mouse and see the cursor moving in the screen, keyboards do not respond at all. If there's music playing, it still plays. The Qubes machine stays 24/7 on, this happens let's say once every 3-7 days, I think. -- iuri.neocities.org -- You received this message because you are subscribed to the Google Groups "qubes-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to qubes-users+unsubscr...@googlegroups.com. To post to this group, send email to email@example.com. To view this discussion on the web visit https://groups.google.com/d/msgid/qubes-users/CAF0bz4RBX_yEAF-Wd5rdgtLsNakHsPbShv0bk6bb4KO21L5i%3Dg%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.