Having a similar issue. Doesn’t seem related to temps which are nominal. Reinstalled Overwatch to a different HDD instead of the SSD. Been trying to diagnose whether it is a Overwatch issue or a hardware issue, but it only recently started happening to me. Using Kaspersky, tried disabling that and Razer software and the issue is still persisting.
Crashes mostly when in QP as I don’t dare try Competitive with this intermittent crashing.