Find a friend who uses a mac laptop to come over and download a program called KisMAC, its a program that uses your wifi card in passive mode and collects packets to analyze for retrieving router keys. You might also be able to find a similarly functional computer for PCs with specific network cards, it seems like you already tried that and had difficulty so thats why i suggest kismac. Start it up at 5 or 6 while your internet is still up and running. Periodically look at it and see what routers seem to be getting traffic, you'll be able to tell by how quickly the number of packets collected goes up. then, if on this particular day your wifi network goes down, pay close attention to any network transferring lots of packets especially if it hadn't been very active before. If its not on the list or it doesn't work well its most likely not interference caused by another router and you'll probably need some more sophisticated equipment to track it down.
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I for one will be making sopaipillas for dinner tonight in solidarity
Find a friend who uses a mac laptop to come over and download a program called KisMAC, its a program that uses your wifi card in passive mode and collects packets to analyze for retrieving router keys. You might also be able to find a similarly functional computer for PCs with specific network cards, it seems like you already tried that and had difficulty so thats why i suggest kismac. Start it up at 5 or 6 while your internet is still up and running. Periodically look at it and see what routers seem to be getting traffic, you'll be able to tell by how quickly the number of packets collected goes up. then, if on this particular day your wifi network goes down, pay close attention to any network transferring lots of packets especially if it hadn't been very active before. If its not on the list or it doesn't work well its most likely not interference caused by another router and you'll probably need some more sophisticated equipment to track it down.