I have 2 Sonos Fives connected as a stereo pair. When I move the volume slider up, the volume will stay at that level for about 3 seconds and then automatically decreases to a low level. Other Sonos Rooms playing at the same time with Sonos amps do not drop their volume, only the Room with the Sonia Fives. I have turned the Sonos system off and back on and have rebooted my iPhone 13. Also my Sonos app is up to date. Any help is appreciated.
Chris