The amp is apparently not so good. Does sound a bit quiet and staticky when I heard a friend use it for Chewie (but staticky may be a good thing for Fett).
Not sure.Think it was just the amp.You may just be able to replace the amp since it's still the same board.
EDIT: Just had a chat with him. Apparently it was some sort of bug with the amp. Not sure if it was a one off, a batch thing or if they all suffer from it.