Wireless Internet - kicks me offline

I have a MacBook Pro w/ an Airport card. Problem: if I stop working on my laptop for more than 5 minutes, I can't get back online without either: a) re-setting everything in Network Diagnostics; or b) Restarting. I'm pretty sure it isn't an wireless signal problem. Anyone know why this happens and how to fix it?

Is your Book Sleeping at 5 minutes?
One very curious cure today was putting these numbers in Network>TCP/IP>DNS Servers:
208.67.222.222
208.67.220.220
No idea why it worked.

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