I assume you have moved it away from Factory Init or it would not work with AES. Please be so kind as to tell me what settings you changed.
But, that said, presumably it worked fine with your settings, and recently stopped. I'm trying to find a way to avoid your having to send it back, but it does look like the most likely solution. You will probably want to contact firstname.lastname@example.org on Monday, or call 201 641 1200.