Sony Ericsson G900 Signal Problem?

Hello, I'm from India and I just got SE G900 from eBay 2 days ago. Everything was fine on the first day. On the 2nd day, I updated the software through SEUS. It was fine the entire day. But I started getting problems with AirTel signals. It has continued throughout today too. I often get "No Network" message. If I switch it off and turn it back on, I get the perfect signal. And, that too, only if it is kept in the same place. If I move it, the signal disappears. What could be wrong? Is it the software update? If so, how can I revert back to an older firmware? And also, assuming the problem is with the phone, is it a minor one or a major one? If it's a major one, I have to ship it back to Hong Kong. If it isn't, I can do it over here itself. Thanks.
 
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