Airport Randomly Shuts-Off; Reboot Will Temporarily Solve The Problem

Are you connecting to the Internet via Apple's Airport Express/Extreme product OR directly via the wireless router?

Do this with your router at home. Connect to the router's IP address via Ethernet cable. You can get this from the router's manual (check also for the initial username and password to access the site). Go to the wireless setup from here, and change the name to something that you can recognise. Make sure that it is password protected. Save it so that it'll write itself to its flash memory (your network will briefly not work). Once this is done, open network preferences on your MBP and search for thisNEW network using WiFi (not your Ethernet connection). Select it and lock it. Disconnect the Ethernet cable, shut down / or put it to sleep, then restart and see if it works.

Lets see if we could get it to work where you mostly are. If that is home, then did you try the instructions EXACTLY as above? If so, what did you get?

No, I dont personally think its the router. I think its the airport on your MBP. Getting the router to reset its flash memory by renaming it for example will also force airport to look for a new network when you accept the new WiFi and lock onto it ... IF you have followed my EXACT instructions. I had this same problem and spent weeks over it.

Well, it is somewhat comforting to know that this is such a common problem (I've seen quite a few others with it around the internet), but no one seems to have a solution. So far, restarting my model 8,1 MacBook Pro has been enough to fix it (though I did have to restart twice once; at the time, I thought that the NVRAM reset I performed on the second of the pair helped, but now I suspect that it may not have been more helpful than a normal restart), but I am both worried about the future and annoyed that I'm having to close everything periodically just to keep wireless connectivity up.

I think I've just made some progress, actually. Possibly fixed it, but I'm not ready to be that optimistic yet. Earlier today, I checked System Profiler at one point while the AirPort was working, and I noticed that it seemed to think that my factory-issue AirPort Extreme was an unidentified non-Apple card. I just tried resetting my SMC for the first time, though, and now System Profiler is reporting correctly (as far as I can tell). My computer also seems to be running slightly faster, but that may just be my imagination. Anyway, feel free to try this, and good luck; hopefully it will work for at least one of us.

Nevermind. I was right not to get too optimistic. Do you have any recommendations for wireless dongles?

Yes, the restart does solve the issue but it hadn't for me. If at all the network showed up, I still couldnt connect to it. I was also using Apple's Airport Express which is quite an old product. I then decided to connect directly to the router. Thankfully, I had 3 different ones. For some reason, the oldest one didnt work. I put it down to planned obsolescence. After after more than 2 weeks of trying everything, I did the procedure above and havent had a problem since.

If you continue to have issues, I'd suggest taking Airport Extreme out of the equation just to see if it works well without it.

I couldnt connect with a wireless dongle either on my NEW MBP bought on 27th Dec. To some extent the machine recognised the device though it didnt show up anywhere, but refused to run anyway. Finally had to make a bug report to Apple for which I'm yet to receive a fix.

What happens when you try to connect with the dongle?