I have an IMac and an Ibook which both connect to the internet wireless via an Airport ExtremeBase station. I wanted to keep my printer in another room to conserve space so I purchased an Airport Express and connected my Printer to it. After setting it up and getting it connected to my network it runs fine for a day or two. Then for some reason it disconnects. When I go to use the Network Utility I find that the WAN password the Airport Express is using is completly different. Almost as if someone went crazy on the keyboard and typed in total gibberish. The think is, only I use my network.

Any ideas as to why and how I would go by fixing it? Thank you.