Well, I have this problem. I'm using a motorola WR850G wireless router and theres a problem with it keeping my laptop using a motorola WN835G card. it seems that every 5 minutes or so, the connection drops. After it drops I need to manually reconnect to my wireless network in order to get it to work again. Then, another 5 minutes later, it drops again. Wax, rinse, repeat, scream bloody murder, etc.
Hopefully somebody out there has a solution to this, if you know of one, thank you for your help.
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1st stop; try to update your routers firmware and laptops drivers.