Lenovo s820 Signal lost and often shows Roaming even in Home network

Hi,
From past 1month I am facing issue with the signal strength and calls automatically get disconnected while talking and it often shows roaming even though I am at the Home network. Pls help.
Earlier I thought the issue is with the network provider but later I found that the SIM works good in other Phones issue is with my Lenovo S820.
My Version information:
Model Number : Lenovo S820
Android Version: 4.4.2
Baseband Version: S820.ROW.V104, 2014/11/21 10:59
Build Number: S820_ROW_8G_S222_141121

can any one reply

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