MacBook Pro only can't find home wireless network

Hey guys!
I purchased a 15" retina MacBook Pro by July. It brought Mac OS X Lion with it: I had no problems.
However, more than a month later I upgraded to Mountain Lion, and I started to have the same problem ALWAYS: sometimes I would be connected to my home wireless network, perfectly fine. However, after shutting down, sleeping, etc, whenever I would turn the Mac on again, it wouldn't find my home network wireless anymore, but it would find e.v.e.r.y and other network available. Also, my phone, iPad, and every other equipment, would find it and work perfectly. After several restarts and wake ups from sleeps, the Mac would eventually magically find it and stay connected for an unpredictable amount of times (sometimes it could find it continuously for some days after some sleeps, and sometimes it wouldn't be found again after some hours of it being found again (assuming the computer went to sleep)). But if I try any other of the available networks it connects with no issue!
And I've been in this game constantly! I've tried (almost) all the Mountain Lion wifi-related posts in the Internet, but none seems to solve it.
I have only found a few posts with my related issue, which I recall: the Mac won't find, ONLY, my home network, while any other equipment can, and it can magically find it occasionally, lasting its connection until the next sleep or shut down.
Help would be really appreciated.
Thank you,
Juan

Hum, good point, the problem may lay with the router compability. My sister, who has ML as original OS has been having the same problem of not finding only our home network, so it seems that the problem lies on Mountain Lion compatibility with the router. I just restarted the router several times and we both got internet at the same time. The question is, as always, how long will it last until it won't find it again.
Now, focusing on the router.
Here, in Portugal (as for the rest of the world I don't know), the Internet provider companeis offer their own modems. Not only that, as those modems are both: modems and routers ( http://imageshack.us/scaled/landing/149/ofibrasjaestaabombar.jpg ).
After writting the above, and re-reading what you said, you lighted me up the idea of entering the modem domain (you know, that url you put and have access to every definiton of the router?)
Well, the password "type" was selected to "WPA and WPA2". What I did was selecting "WPA2" only. So far it seems that it is working. I'll do some restart tests etc etc and I'll let you know! (Maybe the problem may persist, but I'll only know days from know as it may seem, for know, that it is solved.)
I'll let you know, and thanks for the help so far, Sig!

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