I’ve started having this same problem just not at the frequency of most. I’ve crashed to desktop 3 times in the past 5 days. I’ve played 5+ hours on 4 of those 5 days and one day I think I even played 6 hours straight with no crashes. Prior to the first crash on Thursday I’ve had zero crashes.
I’ve had no issues with any other games/programs on my computer. I’ve ran the memtest as other said to do over night and there was no errors. I’m running 10gb ram / 550 ti card on Win 7.
After a crash, I do the repair function but it hasn’t found anything nor has it fixed/downloaded any files. It just tells me I’m good to go and lets me play. For example last night I was in straights of devastation following the zerg after an event…. pop crash. Ran repair…. back in game and went and did Arah and all the final story quest stuff and then ran around for another hour….. no issues. (3ish hours)