iPad mini Retina suddenly stopped charging

I have an iPad mini Retina, iOS 8.1.2, which is now out of warranty, but I got a serious problem with it: One day, while it was charging with an Apple original cable and wall charger, the "This accesory may not be compatible" message was displayed and, since then, it never charged again with any charger. I have cleaned the outlet and the cable itself for any lint, etc., but nothing changed. All the accesories are Apple-branded and original, so I don't understand why is this happening and I'm stuck with an useless, beautiful $400 brick.

Thanks for any feedback on this issue.