Incoming call problem after night

Aug 8, 2015
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I am using my SM-G935FD for last ten months. But mostly I have used single SIM. Recently I am using double SIM.
Now in the morning none of two SIM receive call. Caller get "The customer you are calling is not available". If I call from any SIM to any number then again incoming call coming. Then there is no problem for hole day. Again this problem persist next day morning.
I have formatted my mobile but it does not solve the problem.
Please help me to solve the problem.
 

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