Board Thread:Questions and Answers/@comment-89.151.216.93-20130213194347/@comment-75.36.232.89-20130218173221

well, if you pick back up the cart, it will show you if there is a durability on the cart. Otherwise, what you have is entity de-spawning. Carts can act as entities since they can move, which means that when a 'kill-all' command is entered, carts can be removed. If this appears to be random, then probably it is. Things like carts can despawn. It happens on servers from time to time.