MacBook Pro loses wifi connection upon wake since I bought a new AirPort Express

Hi. I've been using Apple devices and computers since february 2008 and had no problems until now. I currently own an early 2011 13" MacBook Pro and a PC running Windows 7 and Ubuntu 12.10. Until early February, I used a 2nd gen AirPort Extreme to connect to wifi upstairs, being connected via Ethernet to my ISP's modem located downstairs which provides a weak wifi signal (of course my ISP says it's impossible since their modem is the best on the market), not even compatible with Apple's wifi systems (all other French ISPs modems are compatible with it), that's why I had to get a 30 ft ethernet cable running down the stairs. My connection was lost everytime I went upstairs/downstairs so I bought a new Airport Express to replace my ISP's modem wifi signal and I'm using my AirPort Extreme to extend the wifi network upstairs. Now all my devices and computers have a strong wifi signal anywhere in my house with only one downside: My MacBook Pro (and only it) loses the wifi connection upon wake after sleep and I have to disconnect/reconnect it manually. I didn't bother installing Windows on it as I removed the Superdrive to setup a DIY Fusion Drive a few months ago so I can no longer boot optical medias and I can't know if it's a hardware or software problem. Again, everything was working all right on it until I changed my Wifi network configuration a month ago when I bought my Airport Express.
Can anyone help me ?
Thanks in advance.

Well this isn't making sence. 
What is the model # on your extreme?

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