Trunk would be locked shut and driving down the road and the trunk open warning message would pop up. Would try to open the trunk and it wouldn't open with the remote or in-car button. Wife would have to crawl through back seat and pull emergency handle to get it to pop open. There was nothing in the trunk the few times it happened and nothing stuck in the latch/tumbler. Took it to the dealer and they replaced and re-calibrated the tumbler.