I have searched for this in various ways and haven’t found a solution. When I am on Sonos app on iPhone, I am trying to control individual volume of a room when grouped. I touch the volume slider for the group and the individual rooms will reveal themselves above the group slider. Before I can slide volume of an individual room, the sliders collapse back to the group volume slider. They pop up, I try to quickly select the slider for a room but over half the time it collapses again before I can make a change. I have tried on different iPhones and an iPad with same problem. The desktop on my iMac works fine but sometimes I need to adjust individual room from iPhone app.
I have restarted app multiple times, deleted app and reloaded, restarted Sonos system, and so far nothing fixes the problem. Please help.