Internet connection problem

Hai all,
we have a seperate proxy in our concern. In our branch, we have a win 2K server and used for LAN and internet.
From the past 10 days we are facing the problem in every morning to connect Internet. we just reset the IP address, the connection will be ready. How to solve this.
Event Viewer Report: Event ID : 7031
Error Description:The Internet Connection Sharing service terminated unexpectedly. It has done this 1 time(s). The following corrective action will be taken in 0 milliseconds: No action.
Tks