Ive the same issue but for me it got progressively worse. To start with it would happen once maybe every 3 or 4 days, now I can barely get 20 minutes before it goes.
EVGA sent me a modified BIOS which they said 'might' resolve it. It didn't.
Seems like (and this is total speculation on my part) that it is a BIOS fault, but prolonged failures damage the card.
Got my RMA arriving today. My original one overclocked to a stable 2100 and I very much doubt I'll get that lucky in the silicon lottery a 2nd time, but seeing the number of people who are on their 2nd or 3rd RMA I'd be happy if it just works