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When ever I add a sub mini to my one/onesl stereo pair. I loose the stereo pair and one of the pair doesn’t play. 

What are each products SNR level, as shown in your Sonos App? See this link:

https://support.sonos.com/en-us/article/understanding-the-network-details-section-in-the-sonos-app

Perhaps try to get their SNR signal to a strength of 45dB or higher, that’s if they are currently below that level, by moving them closer to the main router. Also try moving the Sub-Mini closer to the stereo pair. If you have any ‘other’ WiFi access points/extenders etc; then switch those off, so that all just connect to your main router and see if that resolves your issue.