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Ran into this issue last week with my Lenovo A10-70f, this is what I've found.
1) If you let your kid use your tablet whilst its charging then sure enough, it will move and bend over time (even if its you who does it) and the internal micro usb port on the Lenovo will get loose. Constant wear and tear like this will damage the internal connectors of the micro usb port. Thus not able to charge.
You can either watch tutorial video's on how to dismantle and replace the micro sd port (ordering a replacement part online) and fitting it yourself or take it to one of those deli style stalls that fix phones and maybe they can fix it. Or
2) There's a bug in the software, that doesnt let you charge when it reaches a certain percentage. There's a programme you can download off the net but I forgot what its called 'A10FIX TOOLS' or something. Dont throw it away just yet.