Yoto Mini will not charge, second defective device

Has anyone else experienced their Yoto Mini stop charging? I just got my replacement player from the warranty after my original device started charging hot then quit charging and eventually would no longer turn on. I got my new Yoto Mini over the weekend and only charged it once. The battery died today and now it will not charge. We tried different USB chords and my husband checked the port for obstruction and even plugged in a magnetic charger connection and tried charging that way and nothing. The device will not do anything. How is it possible I received TWO defective devices?!?!? Has there been a bad production run of the Yoto Minis?