Beep sound after some time intervals

  Pkcool 14:16 13 Jan 2017
Locked

Hello, I have a Lenovo ZUKZ2 Plus phone and Marshmallow 6.01 is installed on it. The phone is giving small beep notification sound after some time intervals. I have tried everything to find out the issue even factory setting reset also but it still there. Kindly help me

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