Can't turn off LEDs on WRT3200ACM

I want to turn the WLAN LED's off so to not have the flicker all the time. The LED's are located in the /sys/class/led, and configurable via LUCI. However both WLAN LEDs just won't turn off (if they do, the wireless shuts down and I need to reboot the router), all other defined LEDs (POWER, WAN, USB) work just as they're supposed to.
What could be the problem?

@kirba22, welcome to the community!

When you reboot, are the LEDs off and WiFi working?

No, after reboot, WiFI's working, but the LEDs are also on.