Have you been looking at the temperatures of your CPU and (when it was installed) the GPU? Make sure your CPU is staying safely below 85 C. Also, you could be having problems due to outdated AMD chipset drivers for your motherboard. Check the website of your motherboard manufacturer for those. Another option is to let the current Adrenalin driver (25.6.1 or optional 25.6.2) search automatically for updated chipset drivers.
As Albert Einstein said, "I could have done so much more with a Big Al's Computer!".