Shoutbox

Reaper it is most probably (if not definitely) overheating as mine has been restarting without warning lately after long periods of up-time and my case does not have very good circulation(also it has been very hot here lately), you could take off one of the sides of your case to help ventilation and if it is under a desk you could move it to a more open area. I would definitely buy some compressed air and get rid of as much dust as you can. And maybe look for a better fan or other cooling options such as water cooling.

Hope this helps.