Sonos stops playing after one song when playing album stored in computer

Sonos only plays one sing when using playlist, songs, albums stored in computer even though and album is chosen as well as shuffle.  This is relatively new event in a six year old system.  Software is up to date.  The first sone of the album stops at the end with the triangle play button showing up again for the same song, not the next one in the album.  WiFi is with ten feet, up to date, working fine on other uses including streaming for TV (TV is off when using SONOS).  What am I missing or not doing?  It has worked well in the past...same equipment, nothing new.  Thanks