I'm like Christian in the fact that it rarely happens to me either (I'm strictly an AI racer). I guess you could test if it's caused by an over loaded CPU by turning down the graphics and reducing the number of cars on the track and see if it still happens!
I find it varies, doesn't seem too bad in the wtcc but in some others it is a crash fest, maybe it can be track related as well?
I have no definitive answer yet. I tried many variations: more/less opponents, low/high graphics, FFB on/off, single Screen/Oculus. Hope I will find some time soon to do more testing
playing wtcc 5 race restarts later to get a clean race, its come to the stage i dont want to be anywhere near the ai slight touches and off i go. makes this sim not enjoyable.