Hi
yours is a known problem due to electric failure.
Send it back for warranty service, or read the russian Ninebot ES1/ES2 FAQ Section 3.3.31:
docs.google.com/document/d/e/2PACX-1vTzl2QxOWdeJQcG0hcBYd-3nnC8XPuhW6VjMi3joZkp52fxQ6jmR0CpPBosIM-K9pygizVaLB9pFRsZ/pub#h.3ab48uhk0h0l
(add http at the beginning...)
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