netconnect broadband loses network frequently

I am using reliance netconnect broadband since last 3 year. Since last few month the problem I am getting is, it loses its network bars automatically to zero and internet connection loses may be after 3 to 4 hours of proper connectivity. I have changed my datacard too but the new one also has the same problem. So its not datacard issue its from reliance tower which is loses network for netconnect broadband frequently.

My Address,
Abhusdaya society, wanowarie, pune : 411040.