Samsung R1 dropping out of connection

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Hello, 

I have two Samsung R1's grouped in my kitchen based on a Deco M5 wifi mesh kit, periodically one or both speakers will drop out and not appear on spotify at all. I can't see a device id on the deco kit app to know which deco they are connected to and unsure if this is a wifi issue (doesn't appear to affect my other devices) or the speakers? 

Any help? Love to know even why I can't see the speakers as connected devices on the wifi when they're running? 

Freddie