How can I set macbook pro to reconnect to secure home wifi after lifting the lid (from sleep mode)

I have owned my MacBook Pro for 1 year now and not sure for how much longer! It is my first Mac so I have been patient as most issues are 'operator eror) but since I upgraded to Mountain Lion OS X 10.8.2, every time I close the lid then reopen from sleep, the WiFi does not auto reconnect.
I have trawled these forums for 6 month now and not found a solution. I have lost count of how many people have added to threrads saying they have the same issue bt I have not found a thread that resolves this issue for everyone. (or me)
Can someone point me in the direction of a final tried and tested 100% fix? Surely if the issue is so bad Apple have some 'patch'? Or is it a router security issue when reconnecting?
I would not reccommend buying Apple to anyone purely on this one issue. I would like to have my faith restored.

JohnTh,
Well, so far, success! I would never have got to that point on my own! I simply followed your procedure and it worked first time.
For info, the router I am using is a Netgear DGND33000v2.
I might go back and do it again, renaming my WiFi back to the original name (the one I used was temporary).
I will have to go round all my other devices and re-establish the WiFi links.
Apple TV
DVD player
iPad
iPhone etc.
As Paul4Laffs reiterates, this problem is viral on the www forums and yet, (touchwood) is simple to fix!?
I hope I don't come back after a few days (I have read some 'fix's have worked but for limited time.)
Maybe you have jut saved this MB from eBay!
Once again thank-you.

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