Just installed my new Deco XE75 Pro - 3 units - all with Ethernet backhaul

Great speed and signal strength

BUT UDP Multicast is 99.9999% broken

I cannot reliably send UDP Multicast messages or get any responses

I already updated firmware and enabled IGMP from Web interface and rebooted

When I first rebooted it worked sometimes

Now 100% broken

Never get messages

This is unusable

Help

Or I will be returning these devices to get devices that are tested and work with normal real world protocol like Multicast - this is insane

I guess I should get a better brand of products

Frontier FIOS ONT - 1Gig download + 1Gig upload - Static IP - Business level account

Sophos XG85 Firewall

Netgear Switches