Have a strange problem with the trunk lock on my 14' TG. When not locked, the door stays closed when riding down the road but when locked, it tends to pop open. This has happened twice now, I was notified by a passing motorist the first time but the second time I didn't know it til I stopped. Anyone have this problem or have any ideas on why this would happen? I've treated the lock with a lubricant and it doesn't seem to be sticking.