your router wouldn't happen to transmit at 2GHz would it? I've had issues with portable phones on the same frequency as my router/access point/adapters when they are in the same room, and the signal tends to decrease when the phone is in use.
Also there could be someone spoofing your network (I've have seen this in action with my own network) and it is quite easy to force all connections to disconnect remotely without proper security.
I would hope you have a WEP key at the very least, though even those can be broken.
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