Download and run a free utility called inSSIDer. It will show you what WiFi Channels are in use locally. Use that information to set your Router's WiFi channel to one that is not in use and is at least two channels away from any that are.
BTW, put all of your devices back to DHCP rather than Fixed Addresses. Fixed addresses should only be used for specific applications or you can get into a mess.
BTW2. Engineer? I bet he/she wasn't really one.
T
November 2010