Doing this as a new thread as I am not 100% sure if this is related to AP Firmware 2.4n, but it seems to be the culprit.
I’m having major issues with my AP6-Pro’s right now. Normally my WiFi can sustain Gigabit speeds absolutely no problems but it seems since Firmware 2.4n I’ve got issues sustaining anything over 20Mbit plus while I do I get a huge amount of packet loss. I have done full access point factory resets, isolated the network by disabling everything and creating a new SSID and default settings etc with no success.
I can somewhat mitigate this if I set the 5GHz channel width to 20MHz - the packet loss seems to mostly stop (unless if I am absolutely smashing the radio) and the network goes in a usable state again but then somebody firing up a stream is enough to kill a teams call.
Doing some real digging on the AP itself via SSH it appears that despite the client associating to a HE80 BSS it is installed in the driver as IEEE80211_MODE_11AXA_HE40 - it seems most clients phymode is forced to HE40.
If I kick a client from the access point using cfg80211tool the driver will then use IEEE80211_MODE_11AXA_HE80 and speeds go back to normal (~900Mbit) but on a normal client reassociation we’re back to HE40 and terrible speeds once again indicating a potential driver bug.
Clients are mostly Apple - the main clients I used for testing in this case was a M3 MacBook Pro as well as an iPhone 17 Pro Max.
Happy to provide any logs or provide access for further investigation but think I have tried pretty much everything here. It is a smaller home network with just 3 access points. If I could downgrade AP firmware as a test that’ll be something worth trying to just isolate this firmware as being the potential cause.