Interesting thread.
I've had my player exibiting this behaviour since fitting it to my most recent vehicle (an aging Nissan Skyline). These voltage drops could be the cause of my symptoms too. My Empeg wasn't doing this in the last car I had though (incidentally also an aging Nissan, but a Pulsar instead). Fitting the player to the GTR also coincided with an upgrade to V3A11, so I'm wondering if this could have anything to do with it too.
I might borrow a battery and see if it cures/alters the behaviour at all.
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Steve