I think this has been stated before but could not find a solution for it, but forza horizon 4 has been going to a gray screen then to desktop. This use to happen every 5-10 minutes of gameplay. Then I turned off all background apps, then it took about 15-20 minutes to crash. This has been happening since winter. It gets pretty annoying as this happens when im upgrading a car, or in a race. When it happens it dosent save.
PC specs
i7-7700k
ASrock z270 exteme 4
16gb of corsair vegence ram
EVGA Geforce GTX 1080 SC
256gb ssd (game is on there)