May 22, 2020
Thank you for reaching out to us!
I'm sorry to hear of the issues you seem to be experiencing with your Bose Music app, I'll be more than happy to help you!
Have you tried uninstalling the application and reinstalling it?
Let me know how you get on!
Dec 5, 2018
I had the same issue for couple of days!
Already did following:
1. Manually updated sound bar
2. If it’s an iPhone XS, opening the app crashed it. But going immediately to app switcher will open the app.
3. Finally, reset all settings of iPhone and it fixed.
You may just want to reset all settings of iPhone (assuming you have an iPhone)!