I am having a problem, i have a desktop that keeps crashing the

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I am having a problem, i have a desktop that keeps crashing the display driver, im running x64 Windows 10, AMD Fx 8320 8 core processor, An R9 200 series (285) GPU, gigabyte 970a-ud3p Motherboard. ive got a nice cpu cooler and numerous fans. but for some reason when i play games on my pc it crashes after about 20 minutes or some (sometimes 5 minutes, even less sometimes) from what i can tell its not over heating my parts, they all run at solid temps, ive tried uninstalling and re installing drivers, ive tired all the drivers i can find that AMD has, i cant see any damage on my board or any other parts. the parts arent dirty, no dust or debris in the vents or fans, and from what i can tell the fans all run fine, im on the PC right now typing this so if it was anything really major id think it would fuck up all the time not just when i play league for 20 minutes. any ideas on what it could be? i dont want to blow money on a new GPU just to find out this one isnt broken...