I use USB HSPDA Wireless 3G modem.
I don't know why this happens but sometimes I find that Though I connect to internet I'm not able to open pages..
I had to restart the computer while modem is connected to browse..

Can you tell me why this happens.. And I even found that my modem speed / Performance is getting reduced .. Rather in other words I would say, My modem performance is much better previously. .

why ??