Lost all my cars!!

I have recently lost all my cars and money and i do not know why. Is there anything i could do to get them back? or will i just have to start over,

Im in the same boat … unexplainable ive tried to do this its currently stuck on 100% syncing go to manage ge and delete save from this console and then boot the game back up … if i have any luck with this i will let you know … really annoying

I would contact Turn 10 at forzafb@microsoft.com and explain the problem. They might be able to fix it.