There's a new Spotify App Update today and after I downloaded it, the problem was gone. I was able to shuffle music on my Mazda while I was on my way to work today. Then, the problem came back. It may be the app itself is causing the problem. really hoping this will be fixed a soon as possible.
I have continued to have this issue since the last iOS update while connecting to the bluetooth in my car (Mazda CX5). However, I have not had this issue whatsoever when connecting to my bluetooth speaker at home or my bluetooth headphones.
I am having the same issue in my 2015 Mazda CX-5...I seriously thought I was going insane. When I am on wifi I have no issues with shuffle but as soon as I get in my car and hit shuffle, like I always do, it doesn't work even though the songs/playlist are downloaded onto my phone. It's so frustrating, I love me some shuffle!! Hope they fix it soon!
I’m currently working with Spotify as I reported this the day it stopped working (iPhone 7+/ iOS 11.0.1 and 2015 Mazda 6 Grand Touring) and they have told me to check for a firmware update on my car. I would recommend reporting this to Spotify if you haven’t already. I used Twitter (@SpotifyCares) and they respond quickly to you. The more people report it the better chances of them actually working with Apple to get the bug fixed!