Hello Michiel,
What platform (Unleashed, ZD, SZ, Solo) are you testing, with which model APs
and WLAN settings? We just released ZD updates with iOS performance improvement
(aka ER-7956) that will appear in Unleashed (200.8 tomorrow, 200.7 soon).
There are acknowledged/published issues with MacOS, with a version recommendation
in a recent KBA-10544 if having MAC specific issues.
https://support.ruckuswireless.com/articles/000010544 I see two knowledge base articles related to Sonos settings and directed multicast feature.
https://support.ruckuswireless.com/articles/000006140 https://support.ruckuswireless.com/articles/000004138