Ariel123,
I don't think it is the pioneer amp. I have an airport express hooked to an amp.
I have win7 on the laptop and OS SL on the mini.
On Win7 I upgraded to itunes 10.5.2.11. I dissabled IPv6. But once I quit itunes and restart, or the laptop goes to sleep, or the song is ended and I wait too long to click a new one, I need to reset the AEX. Meaning pull it out and plug it back in. Me too I'm frustrated.
The Mac with Itunes 10.5 on the other hand works very well. I don't intend to upgrade itunes or the OS.
Maybe worth while mentioning I have a Belkin Router.
My mom is on Lion and has the same problems. Upgraded itunes and disabled IPv6, but problem persisted.
So first turn on itunes (start at boot) then plug in the AEX. And make sure you keep playing songs.
Strangest thing is that she could stream youtube sound to the AEX from her ipad while itunes (or remote on her ipad) couldn't anymore.
This confirms it is an itunes problem.
I can't grasp Mac lets this happen. Really, I can't. They don't even communicate about it!
I have heard about people buying a Airport extreme in stead ot their regular router. To no avail. The problem still persisted. Repairing permissions helps for some.