I'm having the exact same issue. Boot game, hop into Time Trial. Do a few laps, set a new best time, game crashes. Not always though, last time I jumped in I set three consecutive PBs (still learning the track) and it crashed on the third one.
The other day it was crashing at random points around the track, not just when I set a new PB. Thinking back maybe I just didn't notice it at the time, because I was able to lap for about an hour with no issues later on, but at that time I couldn't beat my PB.
Ryzen 7 2700
Gigabyte X470 Gaming 7
16GB Trident Z RGB 3200
AMD Radeon VII
Win 10 2004 (fresh install last week)
- No OC on GPU, CPU, or memory - totally stock
- Afterburner not installed
- Disabled steam overlay
- Disabled XBox Game Bar
- Disabled AMD Adrenaline Overlay
- Crashes in DX11 and DX12 (though DX11 is a CTD, DX12 is a total system failure. Need to reset PSU to get it to restart. PC will occasionally fail to POST on restart.)