Hi mate, you’re not alone with this issue.
I also never had a single crash until the 1.0.3A hotfix on June 30th, and now my game crashes approximately every 30 minutes or so.
It’s not your system. I have a 13900k, a 4090, and 32gb of DDR5 6200Mhz RAM. Brand new machine, no issues with any other games, or even with diablo through both betas and the full release (until june 30th).
There is a main thread here, which has now evolved into people like us who only started crashing after 1.0.3A.