Steps to reproduce:
1. Open user's attached project
2. Build "Test" scene to iOS platform
3. In Xcode, Build and Run
4. When app starts launching in iOS, instantly click home button
5. Notice that debug console has this error: "FMOD failed to initialize the output device, attempting to initialize the null output."
6. Bring back the app to foreground

Expected results: No error, sound plays
Actual results: Error mentioned in step 5, no sound playing

Reproduced on: 5.4.5p1, 5.5.4p1, 5.6.2f1, 2017.1.0f1, 2017.2.0b1

Notes:

• Issue reproduces with and without developer mode enabled in build settings
• Opening the app through iOS device instead of Xcode does not reproduce the issue

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This bug cannot be completely fixed. FMOD initialization failed when an application is being sent to the background. With this fix, FMOD would be automatically reinitialized after bringing an application back to the foreground. However sounds will not be restarted, unfortunately, this is simply impossible with current FMOD based architecture. Developers should subscribe to the OnAudioConfigurationChanged event to restore sounds manually.