[opensuse-factory] Strange crash 11.3

Hi: In my workstation, the following odd situation happends with 11.3 Sometimes it randomly freezes. 1) Keyboard does not respond. 2) Sounds continue playing as normal 3) mouse only moves correctly 4) The desktop enviroment, looks fine, but clicking on the mouse makes no action whatsoever. 5) screen gets minimally garbled randomly in the right corner. I use an nvidia video card with the noveau driver. there is no evidence in the logs whatsoever. question is, where I can start looking ?