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Why does the Nokia Lumia 520 switch off while on a call?

So its been 4 months I have bought this Lumia 520.. First it was perfectly smooth workin.. But after around a month of update its starting to switch off when calling someone or attending anyone's call..
Any help??
Thanks in advance. :)




Hi Ash! Are you sure it's not just the screen turning off? 'Cause that's normal, it protects you from randomly touching the screen which may end a call.



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