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Lenovo A 6000 network range automatically disappears. The phone is required to be reset to restore the network. This happens anywhere in the city and I had also checked with network operator but there is no issue from network operator. I tried to upgrade the system but the upgrade also fails after downloading.

Are you able to elaborate on the problem? From what I am understanding is that your phone is unable to connect to/detect any WiFi/cellular networks? And to fix this issue you must reset your phones data?