Airport Express suffers short and irregular interruptions streaming to iTunes
I have an airport network with an Airport Extreme base station and an Airport Express. Whenever a second airport express is added to the network, streaming from iTunes to the first Airport Express suffers short and irregular interruptions, making the listening to music or podcasts most unpleasant. I have tried restarting all devices several times. Any ideas what may be wrong here?
MacBook Pro, Mac OS X (10.7)