I cannot close the tablet ''power off''. When i press shut down it just opens again automatically after 5-6 seconds. So it must be open all day and night long. I tried: - To press it for a while the shut down button (Problem remains.) - Factor reset erase all data and settings twice. (Problem remains.) - Empty 100% the battery until goes offline, then i charged it again tried to close it but .. (Problem remains.) it opens again when i put it off. Guys help me plz!