Hello 24vern,
I understand that your songs on your iPod nano are playing randomly. That is something that can be set and put back to playing the songs in order. Take a look at the quoted section to access the play controls on your iPod nano.
iPod nano User Guide
https://manuals.info.apple.com/MANUALS/1000/MA1624/en_US/iPod_nano_2015_user_gui de.pdf
Control playback for songs
You can control playback using song controls on the Now Playing screen, the Play/Pause button (between the volume buttons on iPod nano), the buttons on Apple EarPods with Remote and Mic (available separately), and other compatible audio equipment.
If that is not the iPod nano that you have, you can look it up by checking out the link below for a listing of users guides for different iPod nano's.
Take it easy