2011 Macbook Pro Airport card Issues

Hi guys,
I have been having a problem with my 15" 2011 Macbook Pro. Over the last week my wifi has been malfunctioning. I will be able to succesfully connect to my WiFi for about 30 minutes, but then the signal drops. When I click on the connection reticule on the top right it says my WiFi is on, but that no hotspots can be detected. There are at least half a dozen hotspots near me.
After this, if I turn off the WiFi it will not turn back on. I have to restart my Macbook to regain connectivity. This has not coincided with any recent installations of hardware or software.
If anyone has solutions I would be very grateful. I have tried resetting my PRAM. I am about 2 months out of warranty. So, if this does require service I would appreciate any estimates on the cost.
Thank you!
Ryan

Your router is likely fine.
You should first update the Airport firmware for it, simply run the Airport and Software update.
See this
http://support.apple.com/kb/TS3802
And then go to your System Preferences > Network > Advanced > TCP/IP and for IPv6 turn : OFF
Reboot and see how that goes.
When you connect to the router it gives you a lease on a IP address, if your computer's time and date are off this could make the lease expire and you connect and then get disconnected. So check that, see if it holds.
Reset your SMC and NVRAM/PRAM
http://support.apple.com/kb/HT1379
http://support.apple.com/kb/ht3964
Go to your <home> /Library/Preferences and drag the
com.apple.systempreferences.plist
file to the desktop and reboot, it will be rebuilt, hit your Sytem Preferences and reset them.
drag the useless file on the desktop to the trash.

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