Hi, I'm not an IT specialist but have experienced some of issues like yours more or less. So whatever I said could be stupid or not. What I would do would be to disconnect some items: All but the 8's or "crescendo" just to check that it's a problem related to the Beolab network connection or just what I would call "broadband pumping" – too many clients on one network. Then, if the 8's success in a stable connection, I would try to give everybody a Static IP and wire whatever coud be wired. Last thing I would do is carefully access the wi-fi Mesh network; I've seen Airplay speakers just next to a relay connecting by default to one that is two rooms away, thus making the connection instable. Hope this helps.

Do the 8’s have an orange/amber light stating that they don’t have a WiFi connection? Or are you basing that statement on them not showing in the app? And are the 8’s also stereo paired wirelessly?