A friend told me that his bike light (in this case Light and Motion Arc) caused interference with his computer. I thought he was insane. I couldn't believe that a light could cause a problem like this. But mine does it too.
I did a little research. It has something to do with the radio frequency emitted by the light that makes the computer go crazy (I think that's the technical term for it).
I assume you are using a wireless computer. If it is really important, you might try keeping the light and computer as far apart as possible. Or you might try using a wired computer.