Hi, I'm on Xbox and I spent a good day of grind, bought and modified an e92 M3 and got the old M3 up to a performance level of 230. So I got pretty far ahead.
Logged on today, got a "your inventory doesn't match what is saved" and it's reverted me to a stock old M3, no e92, same money I was left with (3k after buying all the mods and car) and the same level.
Somehow I still have my progress, as in I'm level 11 and have the races unlocked, I however have no M3 or any upgrades, and now no money to do anything with, I'm in a point of the game where I need a minimum of 200 performance level but I've been demoted through lack of upgrades back down to 130. Quite upset at the moment and I have no idea what to do