So you flashed the card bios and it started acting up. Then flashed it back.
I get from what you said it's still acting up. Why did you take an such an outrageously expensive card apart? I'd get an RMA and send it in to be serviced. They may do it under the warranty. Just keep quiet about taking it apart.
I took it apart because I installed the hybridb cooler on it about a month ago and I thought maybe a fan lead came off. I didn't even have a ridiculous overclock I was at 1500 stable @1.27v always under 65deg. And it was fine it didn't start acting up until about 24 hours after the flash. But yea. I'll put stock cooler back on and we'll see how it goes I guess.