I'm gonna guess the problem is with your Airport set-up.
Run Airport Admin Utility .... select "Configure" for your base-station.
Go to the "Network" tab...
Look for "DHCP Lease" and set that to a higher time.
mine defaulted to 3 hours and it took me several days to figure out why I had to keep re-setting my modem or Airport every three hours 'cause the network connection was dead. I changed it to 24 hours ('cause I turn stuff off at night) and have never had a problem since.
Comments
Run Airport Admin Utility .... select "Configure" for your base-station.
Go to the "Network" tab...
Look for "DHCP Lease" and set that to a higher time.
mine defaulted to 3 hours and it took me several days to figure out why I had to keep re-setting my modem or Airport every three hours 'cause the network connection was dead. I changed it to 24 hours ('cause I turn stuff off at night) and have never had a problem since.
post again if that doesn't work