Please Help Me Get Past Odd Behavior of Shuffle Gen 2

I have an iPod Shuffle Gen 2 and iMac with High Sierra OS 10.13.6 and iTunes 12.7.4.80. The Shuffle plays the music just fine and holds a charge and is connected through an Apple dock that works with other Gen 2 Shuffles. This 1GB Shuf can be seen by iTunes and list the music but cannot play or change any settings. iPod software is up to date at 1.0.4. Restore iPod throws a 1403 (I think) error and quits, and I would rather not lose the music anyway.

The Shuf will appear on the desktop for about 4 seconds and then disappear. During that short time, Mobikin can capture the data from it and retain the song info after the iPod disappears from the desktop but of course can not do anything with it. Mobikin has worked as expected with other iPods.

So, how can I save the music? Why is Shuf being recognized by Finder and then quickly rejected? Will I eventually be able to use this Shuf as usual?

TIA and forever after....