tricky wrote:
I have this same problem and have figured it out to be a 3rd party program I am running...try documenting closing only 1 program in the system tray at a time before launching a game, and see if the problem continues.
For me it was a background switching program I use called "John's Background Switcher". If I pause it before I play, the problem does not reoccur, but it did take some detective work to figure out which program was the culprit! Good luck.
PS - I am a pc tech, and have used Avast on all my equipment for 5+ years, does a nice job of blocking malware sites and programs without being too obtrusive, and the Home Edition is free.
I just set JBS to stop switching while steam is running, I never got booted out of fullscreen but I noticed that every 30 minutes I experienced some terrific framerate hits.