@A99 Follow this FAQ to resolve your issue.

@Boernie Disable Smart Connect ( Frequenz-Steuerung ) feature (refer this document) and you should be able to do that.

@Zynab You're on the latest FW for your C24 - Archer C24(ME)_V1_1.12.0 Build 230109. I doubt that C24 can have the wireless channels you mentioned even in a new FW release.

@Gustavoppw Test with another power supply 9VDC/0.85A or similar 9VDC to exclude PSU problem. If it still doesn't work try resetting the modem by pressing the reset button for about 10 seconds. If...

@castejonmarc Make sure you're with the lates FW for your RE - TL-WA850RE(EU)_V7_1.0.13 Build 231115

@Actea It seems that this behavior has been observed in other router models as well - details.