Playlist problems

[Cateresa]

Plan

Premium

Country

 Uk

Device

Samsung 8

Operating system

Android 

My Question or Issue

 So before I could go into my playlist and in the search box put say e.g. Calvin Harris. All the songs that featured Calvin Harris would come. I could pick a song and after that song another Calvin Harris song would come on and so on,...... 

Now when I do it all the songs featuring calvin Harris come on and I click on a track but the next one will be the song that is after that track in the playlist , not a Calvin Harris track. This started about 5 months ago and I can't seem to understand why it's changed. It happens with every artist not just Calvin harris. I've tried reinstalling Spotify, no update needed. Any ideas? I hope I've been able to explain what the problem is. Also i know i can change the playlist by artist but I download my music from so many different things it would work.