hi all...i have a sapphire hd5850..now this problem has erupted just a few days ago i guess, as i didnt give much attention to the clocks before but recently when i was playing a game i noticed with the help of msi afterburner that my clocks are stuck at 400/900 even in idle state......if i restart the pc then it temporarily fixes the problem but again the clocks are changed after 2-3 hrs to 400/900.....i have uninstalled the drivers and reinstalled the latest ones which is 11.7 but it was of no use....can anyone help me......