When it comes to cars, I had an issue with one of the pickups, that door wouldn't open. I couldn't get out of the car even when I tried to sit on the other place (and go out through other door). It was just blocked. Then by some time I couldn't even start it (car was fine) but game started to behave like goin into "freeze mode" except the fact that Zeds around were still walking and
tryin to get me (they did at the end...).
I don't know if this helps or did anyone got some similar situation, but yeah... it happened.
(IWBUMS newest update).