With Powerline message "slow connection - reduce bitrate"

[Orion81]

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This is my config:
Host: Ryzen 5600 – TUF B550 Plus Gaming, GTX 1070
Router: Huawei B535-232, connected to a Netgear PLW1000PES powerline adapter

Clients:
Steam Link box connected via Ethernet through the powerline
Samsung Q60 TV with sideloaded Moonlight app (tested both Ethernet and 5 GHz Wi-Fi through the powerline)
Ayn Odin Lite over 5 GHz Wi-Fi

I get random stutters, freezes, and frequent “reduce bitrate” messages. This happens both on Ethernet and on 5 GHz Wi-Fi, and it affects all clients.

With same connection, same clients no issues with Steam Link (1080p 60fps, 25 Mbps) ore Nvidia GameStream (before being discontinued) (1080p 60fps, 25 Mbps) .

Why? It's something I can do? I already tried reducing the gigabit port to 100

Thank you