Tablet does not charge?

Hello,

I’ve been using this tablet for over a year now, and suddenly the tablet has just started to stop charging, for no reason. I take good care of it, and make sure the connector does not bend inside. I’ve used multiple different micro-usb cables that work on different devices, but do not work on the tablet. What am I doing wrong? The charging port still looks brand new as well, so is it possible it could be a software issue?

Thanks all.