But since it is intermittent, I can't replicate the problem on demand.
Because you say software and explain that you don't want a map update? Or, you can say what I said: I told them that the volume was intermittent and that a lot of the time I would start the car and the volume would be low, and wouldn't want to adjust.
I remember having to remove the key from the ignition shutting the comand system down then reinserting the key and switching on the ignition.
I cant remember if it allowed the unloading of disc 1 or loading of the second disc into an empty slot.
Either way I managed to get the second disc in and the updating sequence complete. Finally got it sorted by hitting the #6 key (this was the position of the DVD disc #1).