USB Media worked on recent trip, but now doesn't

[dawgfan]

A few moths ago I tried a thumb drive playlist for a trip and it worked flawlessly. I was able to skip around and it shuffled perfectly if left alone. Just tried again yesterday and it only plays single song over and over. If 2 songs by artist, maybe both of them, but does not shuffle the entire list. Don't understand what could be different this time since both instances were plug in the USB and go?

 

I know it's pilot error on me, but I can't figure out how to hear all the songs. Thanks for any advise.