Unstable data

So I've had my game do weird data glitches a few times where I load in and I've lost progress on cars I've bought and money earned. Tonight I was building a car after playing a ton of night events to unlock ultimate+ parts when it started saying cannot purchase part. So I signed out to see if that would fix the problem. Well when I went back on I had a default character, base car only, no money, all my ultimate part unlocks were gone, but I still had story progress, rp rank, and rank unlocks? So yeah, not gonna grind through all that again. It was fun while it wasn't completely screwing me over...