Worth checking TCP/IP Properties.
Start, Connect To, Connection, Properties, Scroll Down TCP/IP and highlight, click Properties and check that Obtain DNS and IP address automatically are enabled.
Yes, both Obtain DNS and IP address automatically are checked. These are default settings. The problem persists. Especially when the IE is inactive for a while, the connection tends to stall. I need to disable/enable to reset the connection. Any more idea? Thanks.