Hello @AMPLECONCH Thank you for posting on the TP-Link Community. Whether a device supports DFS channels, that is Band 2 (52-64) and Band 3 (100-140) in 5ghz, will depend on its hardware and chip....

@DHUMSHAN If you don't want to replace the router, to assist and figure it out efficiently, I've forwarded your case to the TP-Link support engineers who will contact you with your registered email...

@GregSpinks I have replied to you in this thread, please check.

GregSpinks wrote Is there any update on this? I really want to get the AX23 but not without VPN Client support. How can they both be the 1800 but be a variant with different firmware. It's odd....

@straightup Thank you very much for the follow-up. Please do let me know if the issue will get resolved with the help of our support engineers and update the solution they provided here if possible.

@Noraider If that is the case, would you mind trying to disable Smart Connect on the AX73 to observe if the speed is stable?