And for others watching this thread, I have been advised to disable QoS entirely, which has improved 2.4G's performance a little.

@Sunshine Highly appreciated, I've received the email and responded.

@Sunshine Any updates on this?

Hey @Sunshine, thanks for jumping on this. I have indeed changed the WiFi channel and width using an analyzer to find the cleanest channels. I've tried multiple and all have the same performance....

Hello, Since I've updated to the latest firmware my 2.4Ghz wifi is a fraction of what its supposed to be. On the other hand the 5Ghz band is fine. Any help to diagnose this would be much appreciated....