Well dear, you've probably got one of your characters stuck now, right?
Well it's either your internet connection dying or suddenly plugging itself/pulling itself out. By that I mean turning on and off at random times, or of course, your computer connection cable not being pushed into the socket properly. Thank Gawdz that they added a ''Character Reset'' option in the profile area beside the banner! Just reset the character's home to Lonely Cave, (yes, you're there, but just reset) and then log back into the game and it'll probably work. c:
Hope it helps.