Having the same issue as described here.
I have dowgraded the nvidia driver, but the only thing that changed was the time it takes to crash the first time:
Driver 551.52 (latest): 5 minutes
Driver 551.23: 15 minutes
Driver 546.65: 3 hours
After the game crashes the first time, it start to crash after like 1 minute running.
Nothing is overclocked.
I have reviewed the background apps to make sure that only Steam/OW was running. (For the 3 hours sessions, Discord was open as well).
I can play other games for longer periods without any issue.