We have been experiencing this same problem on xbox one since the start of playing. Work so hard to build up a car, then after 10 or 15 minutes of driving - slowly and carefully - game lags, car glitches, and a slight bump into ANYTHING, even an un-rendered wire fence, completely breaks everything on the car - even when all parts were in pristine condition - and even wrecks the car itself, making it unusable and despawns.