Why does my computer disconnect from Wi-fi every time it goes to sleep?

I'm currently on OS 10.8 but this problem started happening a while after I started using the new OS. It actually started when I moved into a new house. Every time my computer goes to sleep it disconnects from the wifi singnal and so everytime I come back onto the computer I have to choose which wifi network I want to use. I've tried using different routers and now actually use a new Airport Express but the problem persists.
I think I had this problem many years ago and an apple employee just clicked some network setting and it never happened again when I brought the Mini back home. Does anyone have any ideas about this?
I did a quick discussion search and couldn't find this, apologies if it's already been covered. Thank you in advance!

Words cannot describe how angry this problem makes me. How can world's largest tech company not been able to fix their biggest bug for this many months now?!?!
All these forums are overflowing with the same **** problem: WIFI DOESN'T CONNECT AFTER COMING BACK FROM SLEEP ON MAVERICKS.
How many thousands of people have to post the same godddamn problem for how long?
And no, disconnecting Bluetooth doesn't help (even if it did, its not an acceptable solution). I took my MacBook Air to Apple store twice already and they cannot help either.
aaaAAAAaAaaAAaaarrrrghhh, I'm going to go insane from this problem.
I miss Steve.. he wouldn't let something like this go on for this long. Can a half a trillion dollar company pay attention to its own support forums or at least google "wifi-not-connecting-after-sleep-mavericks" and realize what incompetent company you have become?!

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