Well, I'm still at a loss.
I copied over two CD's worth of music to a freshly formatted stick. I copied each album sequentially with a 3rd party file manager in order starting with Track 1. Both sets of music were in different folders with the Artist name.
The playback is "random" and not in numerical order.
Maybe just for the heck of it, I should choose "All random" and see what happens
It may not sound like much, but it sure is weird to losten to music that isn't in the track order that I've been listening to for years. Back to the drawing board...