Hmmm... What Operating system ..?
In WinXP .. Try this :
Start > Run > Cmd (press enter) ..
Ipconfig /all (press enter) ..
See what under what adaper your connection is listed and make a note of it ..
then do this thing ..
Ipconfig /renew adapter (change adapter with the what you have ..Like PPP ) ...
It wont work with DHCP adapters ... If you got a permenent IP address , then it should work ..
Me is also disconnected every two hours from Sancharnet ..And the above command doesnt help me
...