I have a Windows 7 desktop with an onboard Intel Centrino N2230. The router is a Western Digital My Net N900.
My desktop constantly (at least once a day) gets an error that it's unable to connect to the internet. This almost always happens after a few hours of inactivity and has never occurred in the middle of using the computer.
The really annoying thing is it seems to keep everyone else on the network from connecting to the internet.
If I wait long enough I usually get an error about the computer not being able to resolve the DNS server or something along those lines. To fix it I can either disconnect/reconnect the desktop or restart the router.
I've made sure the drivers are up to date and tried uninstalling/reinstalling them. I've also made sure all the IP/DNS settings are set to automatic.
I've attached my Mini Tool Box results.