Sounds like a faulty power socket. There's a contact inside which is displaced when you insert the home power jack, but in some cases it has jammed open so the player always thinks it's on home power. The number of cases of this isn't very high - I think about four players so far, although it's frustrating for all concerned.
We'll service your player and replace the faulty jack. Expect an email from
[email protected] in the morning.
One question (for everyone that has been affected by this) - do you use the supplied AC adapter exclusively, or have you used a third party adapter? If the latter, was the diameter of the plug exactly the same as that on the official part?
Rob