[Help]my N6 auto shutdown without charging...

The same as title said, a week ago,.my device started auto shutdown while I Disconnect charge. Then i tried to turn on it,but it always display Google 1s,and auto shutdown again.(my battery power is full, and could be charged)
however, just i connect with Power Supply, it can turn on ...
is there any method can help me???
thanks!!:confused::confused:

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