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Airport Express dropping out



I've got an airpot setup with an Extreme as a main base station in the basement and an airport express on the 2nd floor (the main floor is between them). The extreme seems to run fine, but the express will drop out occasionally. This morning it dropped out, came back up briefly and then was inaccessible again. Power cycling it brought it back up.

When I say "drops out" I mean that the itunes can't stream to it and the airport admin utility does not see it.

My first question is what channel for wi-fi is least used by other devices?

Any other input, suggestions etc are welcome as well.