@David-TP As I have the same issue as @Nytram with P9 and new beta firmware I can provide you the following feedback Prerequisites: Master Deco P9 unit is flashed with 1.2.1_build_20240925_Beta or...

Deco p9 doesn't set random password for PLC encryption during device pairing. Default password is used to encrypt PLC communcations. This is severe security issue. Traffic between Deco P9 which are...

@David-TP I've upgraded my Deco P9 fleet to the provided firmware p9-SP1-up-ver1-2-1-P1[20240925-rel74665]_2024-09-26_09.21.29 I've manually loaded firmware to each of Deco P9 using web browser....

@Nytram Nytram wrote I'm 100% sure my actual network is suffering. I took one P9 off to try and reconnect but that won't even join again now. I've managed to reconnect P9 slave device to the network...

@David-TP Only master Deco P9 is online in the APP after updating firmware to latest beta. Updating APP to the latest beta doesn't fix the situation. Deco P9_V2 1.2.1_build_20240904_Beta

@JezzaD https://community.tp-link.com/en/home/forum/topic/705786 Try new beta app. 100% cpu load is only then using app/web ui