История для "Phone won't accept charge/turn on"

Hello .. I have a Lenovo k5 vibe plus set  and it shuts down when I stop using the phone . when I lock the phone and after a minute the phone shuts down without any indication . and then the power button does not work so I had to remove the cover and take out the battery and then I put it back again .  this is happening to my phone .. Can anyone suggest me what to do.

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