Hi10 CWI515 randomly shuts down

My Hi10 CWI515 dual boot (Q64G42161000355) randomly shuts down on battery.
I only use it with Android. It functions ok if charging cable is connected. I tried changing battery and result is still the same. BIOS Vendor 5.011 Version 2.17.1249.
I’ve seen forum posts sugesting BIOS update might fix it, but BIOS versions I found on this forum seem to be for a bit different version (e.g. 1611)? Any suggestions?

If you need bios,please contact service@chuwi.com. And don’t forget tell your serial number to them.