The other day I was having trouble getting into a lobby, so I decided to back out to the main menu and work on some paints. The black screen while waiting stayed a LONG time, maybe 7 or 8 minutes; I thought about going to the dashboard and quitting the game, but the “save” reticule/dial in the lower right corner was still spinning.
I finally just walked away, and after about five more minutes (WAY longer than 10 minutes total) I was back at the FM5 main menu. But the background didnt look right, like not all of the screen image loaded. I backed out to the “start” screen, then to the dashboard where I quit the game.
I turned the console off and then back on, reloaded the game and thankfully all my data was still there. I just bought my last car in the game last week - own EVERY car now - so losing that work would have been bad.
I truly think if I would’ve quit the game while it seemed “locked up”, it would have messed up the sync. If this happens to you - leave it alone, let it do its thing, and it might be awhile BUT you might save your data from corruption. In my opinion, anyway.