My phone is ZUK Z2PRO Z2121, mk71.2-z2pro-181213-releases.
I have 2 devices of same OS & hardware.
1device is original battery.
This problem was happen in both devices.
Phone was shutdown automatically.
But, My phones Battery is over 30%.
Some time this problem was happen.
I watched battery level’s display was changed such below.
30%→0%(start shutdown)→30%(after several seconds).
This shutdown is not power outage immediately.
It takes tens of seconds to close the software by normally shutdown.
I think, Software or hardware to monitor battery level is insane.
So, this OS is overreacting to the battery level.
Please wait before judging 0% level and shutdown.
This need 5seconds waiting and checking 2 times about battery level.