Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
The board revision LF R29FA v1.0 4GB is the exact same board used in Powercolor's current R9 290x cards: http://forums.overclockers.co.uk/showthread.php?p=26900763. I wonder if the 390x bios could be flashed to the 290x :)
Probably a pointless question, but is it overclocked? I had the same problem when oc'ing using AB/Trixx, stable in games but sometimes driver crashes when running media or when launching BF3. Trying using stock settings or only CCC now to see if it helps...