Hoping you can help. I recently bought a new airport extreme, set this up as my base station next to my downstairs computer (iMac running OS X 10.10.5). I reinitialized my older airport extreme and configured it to serve as an extender, plugged in upstairs. It works fine. Meanwhile, I've been using my airport express, also upstairs, as a client to stream internet radio from my iMac to my upstairs stereo, and using the remote app on my iPad (now running OS 9.0.2) to access internet radio from iTunes and select stations. Here's a snapshot of how airport utility sees all these elements.
All worked while until a couple of weeks ago. I can turn on my stereo upstairs, go downstairs and use iTunes to select an internet radio station, check it by playing it on the iMac, then switch to airport express and the station plays through the upstairs stereo, so everything seems to be perfect. But when I select "internet radio" from the iPad remote app, I no longer get the list of internet stations. Instead, the cursor whirls, and then streaming stops. Up until a couple the remote app in iPad worked just fine. I don't understand what's going on or how to fix it. Any ideas?