Wierd PC/Gpu problem any thoughts?

Just built a new rig and it runs great except 1 thing.. maybe once a day or once every 2 days my screen will kinds freeze and goes back and forth from no signal to frozen screen.. it only happens when its idle or doing little things like browsing.. i suspect its from gpu.. I have tried newest amd driver and latest beta.. same problem.. When i am doing heavy load things such as gaming i havent had any problems what so ever it seems to happen at idle.. i have ran gpu stress tests and they pass with no problems and great scores.. Its just annoying because wen this happens i have to hard reset then im good to go until the random freeze happens (could take hours to days to freeze) the reason i believe its the gpu is because of the back and forth no signal that happens during the "freeze".. As i said runs fine under load and good temps.. never gets over 65c.. i am completely stumped. Any thoughts on this matter? PC SPECS BELOW

Cooler Master eXtreme Power Plus 500w Power Supply

SAPPHIRE 100355-1GOCL Radeon HD 7850 1GB

AMD FX-6300

ECS A960M-M3 (mobo)

CORSAIR Vengeance 8GB

Nothing is overclocked
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