Is this in Online Kingdom or Kingdom Wars mode? as you`ve mentioned NPC attacking your town, and not another player. And did you try waiting like 5 minutes on the loading screen? Sometimes it takes that long.
It happens in the Onlne Kindom mode.
Sry my fault it was a PVP Player attak on my town. Random NPC Siege on Town are still disabled i think?
And i waited about an half hour one time.
Maybe there are is a connectionproblem. But i did not get any disconnect errors ingame.
I will check the logs when it happens nex time.
Thx for your concern :-)