Proximity sensor

Hey guys few days back I just flashed new android M build num:MPA44I... It was very good.. But the only problem I'm finding is that my proximity sensor is not working properly during calls !.. As soon as I receive the call and place it near my ears the screen goes off but when I take it off.. The screen won't turn on again !.. I've to manually press the power button !.. It was not happening in my previous lollipop! I'm finding it very difficult to manage during calls !.. Any solution for this ?..


Thx in advance! :)

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