I've seen similar posts and was just wondering if anyone had successfully repaired their ZP100 showing similar symptoms. The unit works for 1-2 minutes then becomes unresponsive. The mute button stops working, it disappears from the app and the light starts to flicker and become dull.
I've made a video here https://youtu.be/5N-jx79dhTs
I assume it's a power supply issue, perhaps one of the capacitors is going bad.
I've contacted Sonos support but if this is an easy fix in comfortable to open the unit up and void Sonos' goodwill to offer a repair (if they do).