Yes, I have the same problem. It is very annoying. I have been Googling the problem for a few days and none of the fixes work. I do know, from the computer log, that it is the Sleep function that is causing it, and the reason is because the computer is idle. All of my power and screen saver boxes are checked so that it NEVER goes to sleep, but none of that works. I also tried regedit, with no luck. I have an online exam coming up and need this to be fixed, otherwise it will cause me to go overtime, because I need to keep logging on if the computer is idle for 3 minutes.
Oh and resetting to default does not work. Plus I have a feeling this is not a hardware problem since more than one of us all of a sudden have hardware problems.