I've searched the forums and couldn't find evidence of this being covered before. Since delivery (about 6 months ago) my rear seat passengers occasionally have the rear belt lock on them. The only solution to unlock it is to disconnect and reconnect the belt. This is not the typical behavior where you pull it too far and it starts to ratchet. The passengers are just sitting still and the belt will lock. Sometimes the car is not even moving when it locks. I had service look at this twice now and they say it is working as intended. This means to me that they were not able to reproduce the problem as the behavior is anything but normal. Has anyone else had this happen? Any suggestions for why it might be happening or what I can do about it?