I have a MacBook and a MacBook Pro. For the last week I have had nothing but trouble with my connection to a Time Capsule. I have managed to get a steady connection but it's not very stable (pings jump wildly). Tonight I noticed that it was fine until my wife turned on her Macbook and it seemed to interfere with my connection slowing it down. I am currently using an airport express as a wireless extender (not WDS) to the Time Capsule. This is happening in the room where the Airport Express is plugged in. So is there any reason for interference between the two laptops and how do I avoid it?