rxis

Hi all, I'm having a problem with overclocking my acer v3 772g GTX 760m. When I overclock to +135 Mhz and play any game (any game so far, which have been quite a few) I crash after 1-5 mins. This is not due to overheating, as my gpu temperature is under 60 C. Anyone else have this problem and know a way around it? Does anyone have the bios with full oc'ing unlocked so I can try that? Thank you in advance,