Not overclocking per se, but I did enable XMP in my BIOS. (AMD FX 8350 Black edition on a Gigabyte 990XA-UD3) Could it cause the quasi-instability you speak of? Is there any workaround?
It's also very random: after those 2 crashes in 10 minutes, I was able to play for an hour uninterrupted, then a ...

Another couple back-to-back crashes, with logs and dumps.

As per title, the game suddenly crashes, this does not seem to be related to any particular action since I was always doing different things when the crash happened. In the last week the crashes were fairly random, I can sometime play for 1hr, sometime for no more than 10 minutes before another ...