Temporarily lose speaker in S2 App

My set up is 1 x Play:3 hardwired creating a SonosNet with a number of Play:1/Sonos One dotted around the house.

I have 2 x access points in the house for the S2 controller to connect to (same SSID etc.)

I often get the following situation.  As an example, I’m playing music in the kitchen (this is the only room playing).  I open up the app to stop the music.  The app shows every other room and what was playing - that is you can see the album/radio station image - but the kitchen will be completely blank, so I can’t use the controls to stop the music.

It can take up to 1 minute for the room to “kick in” so I can see the album/station and use the controls to stop the music.

This isn’t restricted to the kitchen, it’s whichever room is playing.

Anyone else seen this issue?  Any idea how to resolve?