I think I'll keep the OC setting where they are now and see if the problem occurs again. If it does, I'll lower my settings.
Overclocks dont last forever, as the card gets older and more abused, max stable overclocks get lower.
Also, bitminterIts a different app as what you used previously, uses the gpu differently and more efficiently than most other miners, that means more heat and more stress. Trust me, just try reducing your clocks. I bet you a bitcoin the problem will disappear.