Can confirm the same behavior, noted here: Overwatch 2 Freezing System - #4 by Baz
I ended up just buying two more 8GB ram sticks and upgrading from 16GB to 32GB of ram. Not a great solution but now I don’t run out any more so issue mitigated lol. Never had the issue on this PC with Windows but something in the Linux stack seems to handle OOM issues less gracefully.