So, I had this problem consistently before season 4, where I would crash 1 every 5 games mid game suddenly to desktop. The warnings log had D3DLOG error and event viewer says it-s a 0xc0000005 error for reliccardinal.exe
Somehow I found a fix, which required me to run the game in windows 8 compatibility mode (I have windows 10). This stopped the crashes, but now since this season 5 started the crashes started to happen again. It’s still not as recurring, but it’s the second time this happened since the hotfix update.