@xman_tt My issues are the same as persons in that thread with the X3000 and X6000 devices, even down to the WMF enable/disable temporarily or rebooting only resolving the issue for a short while...

@xman_tt I'm running my AX1800 in access point mode which doesn't show this option. I have tried in it Router mode and sometimes when that option is off casting works, but then randomly stopped...

Scenario, my router, AX1800 v1.2, is connected to my ISP modem to provide WIFI and LAN connectivity to my devices. The problem is when using any form of mutlicast from WiFi devices, i.e. any device...