Android Network Problem in Samsung GT-i5801

Hi,
I'am having network problems on my GT-i5801. My network is airtel and i live in IIT BHU varanasi.
The network repeatedly goes away but when I search and register on airtel network (by Settings->Wireless and Network->Mobile Networks->Network Operators->airtel), network comes back. I need to do this again and again on intervals since network goes away periodically. Is this the problem of my phone GT-i5801 or network?
Please give any solutions!
Thanks
 
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