Strange bug with controllers and strongboxes, can't pick up items

Occasionally when I finish a strongbox encounter, my character suddenly loses the ability to pick up items or interact with objects/characters. Can't interact with a portal, for example. I can highlight the items, but there is no button prompt visible and the "hand" button doesn't work. The hand button is not assigned to any skill and there are no enemies around me. Trying to unbind and rebind buttons doesn't help. The only thing that works is logging out and back in again. It's not a big deal and it only happened a few times, but it's kind of a strange bug anyway.