Maybe this is a calibration issue. So, try this way...install this module DisableCriticalBatteryShutdown
, obviously through xposed, and activate+reboot, then turn off your phone, then charge the battery to 100% (so full charge), then when fully charged pull off the battery, and wait for at least 5 minutes...that way you can be assured the tab has no more power...after 5 minutes, put the battery back, and start the tab. This may solve your issues.
Linux is like an Indian tent: no windows, no gates, apache inside!!!