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Help Bad Cell Reception Suddenly

I own a galaxy mini with android 2.3.6. Here in India, i used to get almost full signal strength in my college campus until a week ago. Then suddenly the reception has been bad from then and sometimes the signal strength drop below 0 and displays a notification that the network is not available and then once I restart my phone, it shows 100% signal strength dropping to 25% within a minute.
Can anyone tell me the cause for this weird behaviour of the cell phone and solutions if any???
 
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