Do you broadcast the SSID? if so turn it off, change the SSID and dissappear.
<TinFoilHat>
its possible that someone is trying to brute force your wep key (if you have one)
</TinFoilHat>
I'd have gone for the interference on the channel though
onthe other hand if it continues you could always try
here, at least you'll have something to pull out then ;-)