This has happened to us, without a server restart. One of my clan mates was 10 feet behind our V3S, moving things into a tent from it. 1 minute later, he turned around to find the V3S gone. It would be impossible to be driven off that quickly and without noise. 10 minutes later I watched a red UAZ literally disappear while scoping it out. Restarted server, vehicles came back. Yesterday, after a regualr server restart, all vehicles and tents refused to spawn till two more restarts were performed. We check three sites we set up with tents and 4 sites of others we know exist and none of them had any tents or vehicles. It was the strangest thing...