I have been playing forza since Christmas and not once has this happened. i logged onto a friends Xbox one, then logged back onto my Xbox to see all of my cars gone. still have all my money though… Also my my badges and titles are gone. some one Please Help. 
Have you checked its set as your home Xbox?
Try logging out, hard reboot your xbox one (With it on, hold down power button for about 10 seconds). Then restart game, see if that helps.
Long shot, but usually when i lose something, it’s under the sofa! lol
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no. that didnt work. 
i have contacted xbox support 3 times and they have no idea, it sucks because i have over $5 million worth of cars.
Have you tried the console hard reset, hold down the power button on the console for 5 seconds (I think) and it clears the cache so to speak, then reboot the console and try again.
Never mind, missed the reply above.
Also this worked for a friend, delete the game do a hard reboot and reinstall the game again.
Nothing has worked.? I think i need to get into contact with turn 10?.