Good Wireless connection to Network but Usually can't access Internet

My laptop immediately connects to a friend's wireless Roadrunner cable
modem connection w/o problems, but I only occasionally can access the
Internet. Sometimes I'll have internet access which lasts for as
little as a few minutes or sometimes several hours. Sometimes I have
Internet right after boot-up, sometimes its unavailable after startup
but is becomes available later (without restart).

I'm able to connect to other wireless roadrunner connections like this
one: Open authentication and disabled encryption. I have the
connection set for the DNS to be automatically assigned as well as IP
(by DHCP). I always connect as 192.168.0.110 and am able to ping the
DNS within a 2-7ms response time.

I'm using a new Sony Vaio with the latest XP and Norton Security Suite.
I've tried disabling the firewall, but that doesn't seem to help.
I've repaired the network connection, but that doesn't seem to help.
There is one nearby, encrypted network, but I don't think that's the
problem. Its on a different channel.

Sometimes, if I restart my pc a few times, I'm able to get Internet
access. Even when I don't have Internet, I'm always connected to the
network and able to get a prompt reply to my ping. When I have
internet access, its pretty fast. I've gotten downloads rated at over
350k. Its like a lightswitch; when it works, it works great, otherwise
it doesn't work at all.

For what it is worth, the DNS, DHCP, & Default gateway are 192.168.0.1
and subnet mask is 255.255.255.0 I get a lease with a one week
duration. DHCP and autoconfiguration are enabled. The Firewall on the
cable modem is not enabled.

Does anyone have any suggestions?

.

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