my mobile meizu m3  note when calling someone , the person cant hear me well ( sound become very law then fine alternativly on calling) and the sound become to be very weared like the frequancy of sound become law that make sound voice change and the ringtone sound change .... after a while come back to normal.

mobile : M3  note ( international version) L681H
flyme: 6.3.0.0G

whats wrong with my mobile