You may try to reset power management. Or these search result may help.
Resolutions of losing network ...
Resolutions of losing network after sleep mode ... ChicagoTech.net How
to Setup Windows, Network, VPN & Remote Access on
Vista: Sleep & Loss of Internet ...
Jun 4, 2008 ... Posted: Thu Mar 22, 2007 10:33 pm Post subject: Vista:
Sleep ... Now if only I could get Vista to stop dropping my DVD-RW drive
after Sleep, ...
Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on
How to Setup Windows, Network, VPN & Remote Access on
"JohnM" <email@example.com> wrote in message
> When I return my Vista Ultimate computer from either standby or hibernate
> I do not regain my Internet connection. Any ideas would be appreciated.