I assume this is still a hangover of the continual crashing problems of the Winter Wonderland update in December. This January series didn’t come with any update content to download, so I think the crashes and bugs that WW caused are still there.
There’s a thread with more info about it here: https://forums.forza.net/t/new-fh5-season-repeatedly-crashing-and-reloading-winter-every-time-i-play-it
I had a couple of crashes last week, but this week I’ve had several. I really hope they fix these crashes come the February series. The game was fine before Winter Wonderland, but then that update really did a number on it. There’s been loads of reports of repeated crashing, menu hangs etc.
I’m playing on Xbox Series S.