Hi Wavezamani
Have you tried disabling directed multicast on the AP ? If you can access the AP CLI you should be able to do it via below command :
set qos ethx directed multicast disableset qos wlanx directed multicast disable
In above x would refer to the interface in use.
In case you can't access your AP CLI you can open up a case with us via https://support.ruckuswireless.com/contact-us
Best Regards
Vineet