Mesh network and Sonos; disconnected to Apple Music (but after reboot of Mesh system it's back to normal - strange)

[kiddingguy]

I have a 3-pack TP-LINK Deco X10 (WiFi 6).

Configured and connected (same SSID as the WiFi network).

For some reason when playing music on my Sonos Play:5 the music suddenly stops. After rebooting the Deco set, and reconnecting Sonos (to Apple Music) everything is back to normal.
I have now connected Sonos also wired, but still these issues appear.

Config [basically all Decos are in 'one line' on all floors):
ground floor: modem,as well as one Deco (wireless, connected to (main) Deco on first floor
first floor: (main) Deco, wired connection
second floor: Deco, wireless connection

Any thought why this is happening?

Is this a TP-LINK thing? (mis)configuration?
Or can I better opt for just a FRITZ!Repeater 6000 AX repeater on the first floor (and hopefully have good reception throughout the house). The modem I'm having is the FRITZ!Box 7590 AX.

[kiddingguy]

For some strange reason I do have internet connection with the SSID with my notebook.

The Sonos is connected wired (and its own wireless network) in the same room as my notebook.

I used to have the TP-LINK Deco M4 (WiFi 5) with no issues on my Sonos.

[kiddingguy]

Configuration was to (default) WiFi router.

I changed this to Access Point. Hopefully this helps with the improved, more stable connection.