PCARS3 crashed once with all three controllers plugged in, immediately on a first race start two days ago. Then I unplugged the flightstick, and the game was stable for the rest of that gaming session.
I'm waiting for the new display adapter to arrive until I'll start putting serious time into PCARS3, as the career mode tracks and weather conditions are so taxing on the hardware that they are very uncomfortable in VR. Meanwhile I occasionally test new cars in quick races on a good weather. But since the quick races do not have the same freedom with car tuning options as PCARS2, not until career advances enough at least, I'm kind of stumped in the game at the moment.