My kids each got a 1/18 ruckus today. Within 5 min the rear shock on one had popped the threaded top off and the oil drained out. I rethreaded it and it seemed stable but it happened again within 5 min. The other shocks and truck are fine. The threads don’t seem stripped and seem to grab but it keeps popping off. Any advice? I know shocks are cheap but seems like it’s a defect if it failed within 5 min of new, just driving around, not even going off jumps.