Macbook loses wifi, prevents other devices from connecting too.

Hi guys
I have a strange problem whereby my macbook seems to lose its wifi connection, and prevent all other devices from connecting to wi fi either.
its very odd as the router still shows up in available networks with full signal, but I cannot connect to it and neither any other device, including ipads, mobile phones and various other windows laptops.
This can only be fixed by restarting the router, which is a pain as its tucked away upstairs!
I know its my macbook casuing the problem and not the router as the problem didn't exist until I came home from uni, and it hasn't happened at all over the last two weeks while my laptop was away getting a new battery. Today I got the macbook back and the problem has returned! More than a coincidence me thinks!
This can happen three or four times an evening and is very frustrating, especially for the rest of my family!
Once I have restarted the router the connection normally comes back, however sometimes I get an exclamation over the wifi logo in the menu bar, saying no internet connection.
My macbook is a aluminium 2ghz core 2 duo running OSX Lion with all the most recent updates, and the router is a BT homehub 2.0.
Any help would be gratefully appreciated!
Thanks in advance.

I have had this problem after my (work provided) 2008 macbook was updated to mountain lion. I have tried all the suggested fixes with some success, resetting PRAM has occasionally sorted this out, deleting the wifi and then re-starting and restoring works, but is very tedious to do every time you need a connection!!
A further wifi problem caused by the update was the loss of access to passwords in keychain- checking the 'access by all applications' box in keychain preferences helped reconnection too.
The tip I wanted to pass on is this-
If you are having these problems, and resetting the wifi has sorted it out, turn off the wifi Every Time before you shut down the machine. This simple action seems to allow the mac to keep it's settings intact, and it can be turned on again without any problems the next time you boot the macine up.
The connection problems can't be hardware- this machine is as fast and stable as the new retina mackbookPro it sits beside- when it can see the signal......

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Macbook loses wifi, prevents other devices from connecting too.

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