Buggy Dragon's Stand
This is somewhat common. The map thinks there aren’t enough players on it so it starts the 1 hour closing timer. Then even if more players show up to play it will close anyways and boot everyone out after that 1 hour. It can happen on any map although people will only really notice it on the new HoT maps.
Odd though – map closing timer is 1 hour, DS is 2 hours. OP said over 1 hour left on the timer. Some information is wrong or something is bugging.