unfortunately for me it happens while driving. I'll start driving and then 1-2 minutes later (haven't actually timed it yet) the screen goes black and then I'm back where I started.
If I crash into anything the vehicle retains that damage when it warps back, but if there are zombies around that start location I and the vehicle take damage from them like the car never left that spot.
I also tried driving some vehicles a short distance and then getting out to see what would happen and the vehicle still ends up warping back but my character is fine and stays in the correct location.
Fresh characters don't always seem to have this issue, but "old" characters always seem to. the character i created yesterday was able to drive around and loot. but once I logged off and came back that character could no longer drive without warping back to the position i parked the car before exiting.
I'll update with some video later today when I get a chance to play some more.
also as a side note, not sure if I've been suuuuper unlucky or if it's just the server setting, but car keys are really hard to find. Just about every character I've made takes a few real world hours to find a car with a key in/near it, and then most of those end up being out of gas.
It was frustrating to spend that time looking for a vehicle only to have it warp back, but now that I have a rough eta on the fix, I know not to waste my time searching.