I have had a Nvidia GTS 250 512 PCI-E for a year now. When my computer is on for more than 5 hours my games begin to run faster than they should be. For instance I play Aion and when my computer is on for a while my framerate jumps from 60fps to 300-1000fps. Restarting the comp temporarily fixes the problem but I dont want that to be my only solution. Please help.