This issue persists since the last few updates for the Spotify app for iOS. The problem only occurs when an iPhone is connected via Bluetooth to the head unit and the app automatically turns off shuffle and turns on the loop. I tried to reinstall the app, restore software on my iPhone, but nothing helps. It's very frustrating that I have to listen to my music in the same order every time I'm driving and it wasn't fixed since the last update.
We recently discussed about this issue in the following thread, but there was no response, so I made an issue thread here.