Forza syncing issue on the Xbox one

On Saturday 19th December I put my Xbox account onto a friends Xbox one so we could play games. Yesterday I went back onto my Xbox one and attempted to play Forza horizon 2. It took a very long time to sync, so long that Xbox turned its self off. I then tired to play Forza Motorsport 6 and the same problem occurred. I have contacted Xbox who tried to fix the issue, they are telling me it is a Forza problem and not theirs. They suggest I contact you hence this email. Can you suggest how this issue can be resolved.