Had been happening a lot recently to me and trucking group, most recently 2 or 3 of us in Yuma at repair garage.
Engines off parked talking on discord, we all get truck damage at 1-2% randomly up until about 50%.
Have brought up tab menu to see nearby, now not trying to blame people but clearly have seen damage go up randomly while someone is in range, nobody around we NEVER get random damage, ONLY around other players.