I also jumped back in recently after a year out. The driving physics are still abysmal, and the repair bug still exists where your vehicle just spontaneously flies off in all directions hitting everything until it blows up.
Apparently it's due to the doors falling off. They're still on the map and don't despawn, when you repair the vehicle they travel to it with such velocity they smash it up... At least that's what I read
Undead said they thought there was a fix but I had the issue the other day, had to reload the save.