Solution for 'my mac will not reconnect after sleep'

After lots of trial and errors I found the way around the problem of dropped or very poor wireless connection after you put your mac to sleep.
I have no idea what the problem really is but this procedure has stopped me from throwing my brand new MacBook through the window.
1) Go to System Preferences -> Network -> Advanced
2) Remove any network you have there memorized
3) uncheck option 'Remember any network this computer has joined' (leave the other options also unchecked)
4) press ok and switch AirPort off ... then on (make sure you have 'Show AirPort status in menu bar' checked)
Now the only real change we've made is to stop Mac memorizing our network - but here lies the solution.
Put your MacBook to sleep and than wake it up. It will not connect to the network (none are memorized) but all you have to do is choose your network name from the list on the menu bar. It might ask you for the key but in my case it simply asks for permission to use my KeyChain (memorized WPA2 password).
Once I press 'Allow' .... it works as it should! eureka!
Do not check 'Remember this network' when asked for password.
As long as Mac does not store your network details it reconnects without problems, once you allow it to store these details, re-connection after sleep goes pear-shape.... figure it out Apple!
I hope this might help you (as it most certainly works for me)
best regards
ffar

I've run Keychain utility. I also removed (as suggested in various places) any entries referring to my wireless password in KeyChain and allowed them to be memorized again. It doesn't change a thing.
Please understand me correctly. My Airport does re-establish connection automatically (if network details are stored) but connection is extremely flaky, slow and with frequent dropouts. So the Keychain is not to blame here (I think).
If I establish connection 'semi-manually', as described in my previous post, it is perfect, just as it should be. This would indicate to me that the problem lies not with the Keychain, but in the way OS stores network details.
If I do not allow OS to keep network details - re-connection works.

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