Vehicles teleporting around then underground

me and a friend play on either my game or his. everything has been for the most part normal in a20 with some minor glitches. but once we started getting gas vehicles his and only his will move on their own. he will come back from where he left it and its sometimes just a bit away from where it was and other times it was 50-100m away. then the other day his truck started teleporting away from him. as he got close to it it would move again. then it dove underground. the only way to get it back when this happens is to close both our games and restart. it usually comes back where it was but doesnt seem to take long before it starts doing this again. I found out that if I place the vehicle it seems to be better but still does it after he gets in. none of my personal vehicles do this only the ones my friend gets in. I'm wondering if this is a known glitch or is there something we can do to fix it?

 
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