Battery drain in Chuwi Hi 12 Android

I have hi 12 dual boot windows and android. Using Windows is ok but the problem is when using android and the system goes to standby. It drains all the battery and I can’t turn it on until I charge it and turning on again.
I just wanna use it as a normal android tablet but in this case I have to switch it off after using and wait for booting again to turn it on.
It happens two times only that it didn’t drain the battery and work as it should! Is there any update or fix I can try?
Thank you very much for helping :blush: