Did you drop it at all? I (my cat) dropped (knocked over) a EVOD maybe 2 feet and it did the same thing. Took it apart just to see, not to repair, and the wire connecting the pin is just barely attached at all. Next one you get just turn the tank lightly till it stops. Dont "screw" it on or the pin will spin and snap the connection also. Glad yours was under warranty, mine wasn't. Same with the charger, if it ever needs to be on tight to make connection it just needs to be cleaned usually. I just wipe them with paper towel as its usually just a bit of juice or something on it.