So I was in the process of writing a long essay here about my ipod isn't being detected my my Z120bt because it is losing it's charge and because it is staying powered on after I powered and left my car sitting for many hours.
At the same time, I was on hold with Pioneer to see if they knew anything about this because I was not sure that they did. They finally picked up the phone and answered my question. I will test their idea out and see how it goes.
They say that the ipod's sleep setting needed to be enabled. This totally makes since, though I didn't even know my ipod had that Sleep option (other than pressing the play/pause button) until he told me this. It's buried deep in the Settings/Main Menu list.
So I guess I'm posting this just in case there are other people who have problems with their ipod not being detected sometimes. Hope it helps.
Thanks
Murphy