Why is QOS assigning a Low Priority to Speakers/Media Players?

I have AirPlay Speakers set up around the house and bizzarly NightHawk is assigning these with a LOW QOS setting?

The speakers keep dropping out despite an 87% Signal Strength at 54Mbps another one with a 99% Signal Strength at 54Mbs both on 2.4Ghz

The 5GHz is not much better - The Lounge Speaker (which is line of sight of the NightHawk 20ft across the room is reporting 100% signal strength at 150Mbps.

And yet stutter stall throughout the house.

These devices worked better on the old wifi but were subject to the wifi occasionally just dropping for all devices hence the 'upgrade'.

I would set the speakers to a higher priority if they showed up in the Attached Devices, which despite connecting to the Nighthawk and streaming albeit stuttering audo are attached to the Nighthawk.

Is it just that I have a bad Nighthawk or are they all this bad?