@Kevin_Z Hello, I am sure that problem is firmware. Two weeks ago I installed OpenWrt on router instead of original firmware and now everything works fine (LAN, WAN, WiFi 2.4 and 5GHz).

@Kevin_Z My answers: 1. Yes, only 2.4GHz wireless cleints are disconnecting, 5GHz wireless is disable all the time. 2.4GHz has set g/n type. 2. 5 devices (two smartphones, two notebooks and printer)....

Hello, I have the same problem with Archer C6 with newest avability firmware version. Once a day devices are disconnecting with WiFi. In devices WiFi network is visible, but nothing of them can't...