I had similar problems and the issue solved itself.
Unfortunately I don’t know with of following did the trick
I turned the tablet completely off and charged it overnight with new charging cable and with a good 2.5A universal USB charger.
I know that the cable quality is crucial for the tablet’s charging cycles.
Cheap/thin/long cables just don’t work… 🙁
Even “high quality” USB extension cords may cut the charging power with 1/3’d !!!
Read comments here:
https://techtablets.com/forum/topic/warning-about-2-5mm-dc-usb-charge-cables/
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