I have around 20 2.4 devices. It might be 1 or 2 rogue devices that might be causing the issues I raised a ticket with the support and waiting to hear from them. I will keep the thread updated on the...

yes, the firmware is the latest. I got a replacement from Amazon and the new one also the same. Before C5400 I have a netgear router and it didn't have any problem with 2.4.

Model : Hardware Version : Firmware Version : ISP : C5400 when I have the problem I am not able to see the 2.4 wifi in any of the devices. Channel shows as N/A in web interface and I don't have any...