I'm guessing you are connecting to the Marantz and staying connected. For some reason if you are connected to the Marantz when Crestron reboots, Crestron can not reestablish the connection until the s

I have tried using the same phase for all channels and using two separate phases for channels 1-4 and 5-8. Neither seem to work. It's like channels 5-8 are somehow blocked/protected electrically.