Thank you for understand me, at least partially
I have done test with hibernation and the problem is the same as with sleep: it doesn't wake up.
As I said, it happens with two tablets: a z8300 and a z8350. On both OS, win10 and android. I have reinstalled from a clean image windows 10 on z8300 and it still happens.
So, I cannot hibernate or sleep the tablet. I think this situation is unaceptable and there are more people with this problem, but chuwi doesn't answer.
I have tried everything, from downgrade bios, to upgrade, reinstall windows, try forum drivers, windows drivers, intel drivers, windows 10 anniversary, windows 10 creators, and none of them worked...