I have never heard a report of random music playing from the app in the 10 years the app has been released so you must have some pretty unique situation going there. Not really sure what to suggest to figure out what is going on. If the song title isn't showing in the top right of the app, then it really doesn't seem likely that the app is actually triggering that playback. It seems more likely that some other app or maybe the Apple Music app is going rogue and playing things.
Are the random songs actual songs you have added and configured in the app? Are they songs in your library on the device? What type of communication link do you use with the audio equipment? Any chance someone else is taking control of that equipment? Have you ever heard the oddity when not connected with external equipment?