Hello,
the problem is that the off tablet shows that it is charged completely. Android shows 93% (never 100% not shown), the battery on and off as 5% of the battery. The same is true on windows 10.
What to do?
I noticed that as the android goes to sleep and then after 5 minutes. you can not wake him. The tablet does not react as if he was dead. Only helps recharge and wait 5 minutes and then start the tablet ..