Hi all,

I’ve been using the Archer C5400X since it first came out. Over the years I’ve upgraded my internet plan from 100 Mbps to 500 Mbps, and recently I started noticing a few problems that still haven’t been fixed, even with the latest 2025 firmware.

1. 5GHz-2 speed drop
My router is placed in a small utility room, and my bedroom is directly opposite that wall.
The 5GHz-2 band is set to:

• Channel 149

• 80 MHz channel width

• Transmit power: High

The signal strength is around -47 dBm, but sometimes the speed drops below 100 Mbps, and other times it can hit full speed (~480 Mbps).
5GHz-1 (channel 44, 80 MHz) always gives me full speed under the same conditions.
I usually keep Smart Connect on, but turning it off doesn’t make any difference — the issue is still there.

2. OpenVPN unstable
The built-in OpenVPN server keeps shutting down by itself. Sometimes it stops after a few hours, sometimes after a reboot, or when I disconnect for a few hours I can’t connect back anymore.
I’m using TP-Link DDNS for the connection, and I’ve confirmed it’s not the cause of the issue.
TP-Link support already acknowledged the problem before, but there’s still no fix.

3. LED control bug
The LED on/off setting doesn’t stay after a reboot — even if I turn them off, they come back on after restarting.
The Tether app switch for LEDs also keeps resetting itself or turning back on randomly.

The 2025 firmware update was nice to see, but none of these bugs seem to be fixed yet.
Would be great if TP-Link staff or other users can confirm if these issues are known or if there’s any workaround.

Thanks.