This issue started after the phone fell in water. I had given the phone for servicing. Still no use.

  • Most likely there's irreparable water damage to some components inside the phone. Who handled the service - was is official Oneplus warranty/repair department, or a 3rd-party?
    – Chahk
    Oct 17 '16 at 12:41

The phone has water damage and these effects are permanent.

There isn't much else I can say.

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