I am having an issue where the title screen constantly loads and a message saying “Syncing data for Forza Horizon 2…” is displayed and the sync is at 100% and it just stays there. Everytime I reboot the game the same thing happens.
All other games are ok so its just FM2, anyone have any insight?
That sucks maybe an Corrupted gamesave?
I hope not.
Hard Reboot your console first by holding the power button for around 5 seconds. Unplug the power cable and wait a bit then start it back up.
If the same problem occurs. Go to “Network” and clear the “Alternate MAC Address” as well as the persistent storage in the Bluray and disc section then do another hard reboot like before.
The final resort would be to remove your profile from your Xbox entirely while clearing both the alternate mac address and persistent storage like before as well as doing a reboot. When you turn on your console, load your profile back onto your Xbox from the cloud and it should reset your sync data and work. Theoretically of course… Keep in mind that by removing your profile, every game save you have will need to be resynced to your Xbox which is kind of a hassle.
I had to restart when I reached level 167 weeks ago and I tried eveything in my power for two days to try and get it back. Xbox Support, emails, facebook, twitter and really didn’t get anywhere… I was forced to delete my game save and do it all over again. The game simply froze on me at the title screen as soon as I hit a then it was back to the dashboard everytime. The servers just couldn’t read my profile data and it crashed the game. Very frustrating but it’s fine now since I’m level 320 even after all that with all the achievements done 
Glad it hasn’t happened again to me.