This has happened twice so far. The first time I found a green ADA 4x4, drove it to my base, drove it into the base past 3 gates, and as soon as I pulled in up to the stairs on a watchtower I lost connection to the server. When I reconnected the 4x4 was about 50 meters away on its side, with a tree growing through the driver window, and the parts and chassis were ruined. I found another green ADA 4x4 a few days later, drove it into my base, and parked it between two gates, one on a fence on the back of the ADA and a gate on a watch tower on the front of the ADA. I logged off for a day, logged back on, and the ADA was completely gone. The three fences and gates surrounding my base were intact, and nothing was missing from my base, so I can't imagine what else could cause the car to disappear. Since it happened in the same spot, I'm guessing it was a similar glitch. Both times the ADA had all 4 tires, battery, plug, and radiator installed.