This has happened to me many time before because of my crappy wirless router...stupid Telus...but what I find is that if you turn off the router and shut down the computer if you can, then leave it for about 30 seconds to a minute, it should be able to connect. But if the problem persists, you should look into getting a new wireless router.
If you're using an ethernet cable, I'm not sure what you can do since the connection should be as strong as on your computer.
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