I experienced today a "low fault tolerance" interface problem.
Our group was in queue, while i was checking map.
So i press Escape to leave the map, and at that moment the queue popped.
The result was loosing the queue, getting a debuff.
All i am saying here, is that a proper software must protect from these mistakes.
You can fix it by making a button to re-enter, or by having a confirmation text when you attempt to leave the queue.
Either way, it's a bad design. Please fix in future.