Thanks for further clarifying @Paul_Curtis. It sounds like the system mixer for this Android device is prioritizing Zwift notifications in certain conditions. Please note that there’s ongoing development related to Audio Focus on Android phones with ARC, and certain notifications from third-party app audio will be sufficient to pause ARC entirely.
Please see this feature request thread, where users are making their voices heard: Focus ducking in ARC
There’s ongoing design and testing to provide improvements here. In the meantime, you may be able to alleviate some of the interruptions in the system notification settings for the phone, or in Zwift’s own app settings. Thanks for your patience in the meantime.
If you continue to experience issues with playback in either Roon Remote or ARC, please let us know in a new thread, as there might be underpinning issues with your Core local file storage, per my post above.
Happy to answer any questions!