Sapphire Toxic 5850 problems

I got a free 5850 off craigslist, it was bricked, i re flashed the bios and it works again. About 2 weeks after i fixed it, i started getting a grey/black screen with either white or green lines going up and down and my music was still going only the display went out, and only when i was playing world of warcraft. I re installed amd drivers as i was using the drivers i had installed with my crossfire 6770s. That seemed to fix the issue and it worked fine with no issues. A few days ago it happened again with wow, and now it just happened twice in a row while i was on wow. it seems to only happens with world of warcraft running, as when i rebooted and got into windows i loaded wow right away and it did it again, now im typing this with non WoW up and it seems fine. It does not do this during bf3, BOII, or skyrim, so wondering if anyone could help. I know its a free graphics card but would still like to get use out of it
 

chromic

Honorable
Jan 6, 2013
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just for the heck of it, download msi kombustor / furmark and do a burn test. if temps start to go +-90 just close it and report back here

edit : my 5850 idles @ 46c but under load @ stock 75c (burn test) around 60-70c when gaming