its possible that if their signal is stronger than yours, your client may switch to their network and they might just have a slower connection, or be utilizing alot of their bandwidth. You should watch your connection info and see if you are switching to their network. If you are, you can fix this by either prohibiting your client from connecting to untrusted sources (varies by brand of wireless software your using), or designate it to always use this connection, and specify yours.
two networks shouldn't interfere, especially if they are running on different channels. If you are loosing signal from your network intermittantly, i would try relocating the access point or look for possible interference producing devices (cordless phones, microwave ovens, etc) in the vicinity.
Depending on your brand, you might find some relatively cheap antenna upgrades you can throw on your router, or you might also consider getting a power over ethernet adapter for your wireless AP if there is one made for it, and send a piece of cat 5 up into your attic and place the AP up there. Its amazing what a little elevation can do for your signal.
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