I've noticed that sometimes if I put my desktop into hibernation mode I will get a spontaneous hard freeze (screen freezes, mouse and keyboard no longer respond) usually in the first couple hours after I wake up my PC. It doesn't do it every time, usually 2-3 times a week and I probably put my system to sleep an average of 10 times per week.
I have been running my system without putting it into hibernation mode for almost two weeks now and have not experienced a freeze.
It seems to only do it when I have Firefox open, but I have Firefox running 95% of the time. Could this be related to Flash or audio drivers?
I am running Mint 7, an 8500gt video card with the latest Nvidia drivers, on an ECS 945GZT Motherboard (intel 945gz chipset)