william_oliveira87, John Linden, If port is found to be bad/loose/damaged , this is really not a repair for the inexperienced because the charge port for your device is soldered to the mother board and the heat generated could cause further damage if not very careful. I will post a link to a tear down guide to get you inside the tablet to check the charge port and will also post a link showing what is involved in repairing a USB charge port attached to the board. The last link is to new charge port, which you can also do a search for better pricing perhaps if needed. If not wanting to do the repair yourself have a good computer/cell phone repair shop have a look and estimate repair. Good luck.
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https://www.youtube.com/watch?v=8jqw-KwCQIc
https://www.youtube.com/watch?v=Bl_6g4GV9RM
http://www.ebay.com/itm/2X-Dock-Connector-Socket-USB-Charger-Charging-Port-For-Motorola-Moto-G4-G4-Plus-/361876977343?hash=item54418c76bf:m:mARhGS9UuGM4yupOXtU7G8Q