Need way more information on what Sonos, what Controller and which music service to be any help, 

Hi ​@AlainDex 

Welcome to the Sonos Community!

If you are pressing the play button on the speaker, then you are asking it to play what is already in it’s queue. If it only has one track in it’s queue, that is all it will play.

If you are sure, however, that the speaker does have multiple tracks in the queue and only plays one of them when you press the play button on the speaker, I recommend you get in touch with our technical support team who have tools at their disposal that will allow them to give you advice specific to your Sonos system and what it reports.

I hope this helps.