I have a 2-monitor Windows7 PC. A few times a day, both screens go black for about a second. When they come back, I frequently find all my windows have been moved onto my primary monitor, maximised windows have been un-maximised, etc.
It's a bit like a monitor has been unplugged briefly but both go blank and I have double-checked all the VGA and power cables are properly plugged in.
I wonder if it could be a driver issue, or a hardware fault, but I don't really know where to start since I can't find a good Google search query, and I don't have spare graphics cards or monitors.
Any suggestions on where to look for more information or what to try are very welcome.