Airport Express dropouts?

I have an Airport Express that I use 24/7 for streaming iTunes to an FM transmitter centrally located in the house. iTunes runs here on my X Server machine. To my disappointment, this "gets confused" about once a week where I have to deselect and then reselect the base station in iTunes, and the base station has to be rebooted about every other week. Anyone else seeing this with Airport Express? dave