Media for Really Bizarre WiFi Network Problems

Really Bizarre WiFi Network Problems

We are currently on our third wireless base station. First was a Netgear, next came a Linksys and now we have an Apple Airport Express. There are three laptops on the network, not all of them on at the same time. One is an HP Pavilion running XP, and the two others are Apple Laptops. The problem has been the same with any of the three base stations. With no rhyme or reason the connection to the internet is dropped. The broadcast signal from the base station is fine. The Motorola Surf Board cable modem seems fine and the cable company says everything tests out fine. When the connection drops sometimes a reset of the modem and base station gets us back online but sometimes it does not. Sometimes we have to actually wait hours to get back online. Hard wiring to the back of the modem always works perfectly. I have changed the channel that the base station uses. While we have a cordless phone and microwave oven there is no correlation with them and the problem and the base station is far from them. I know there are other wireless networks in the neighborhood but I doubt any of them are broadcasting on channel three. I have changed the channels around and there doesn't seem to be any affect regardless of the channel. this is becoming a major frustration and problem because we are trying to work from home and rely on the internet to work. Any ideas?? Thanks!