Does it connect to the network and disconnect from the internet or disconnects completely from the network itself? It could be the cable modem your using. I work for comcast and sometimes the modems will crap out.
First i would upgrade the firmware on what you have now, move the router to another room in the house appliances could be an issue and if all else fails pick up a new router. If your laptop works fine in your gf's place then it def isnt the computers. Get a wireless N router, they have much better signal strengths and the distance the signal travels is remarkable.
Just my .02 cents.
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