Flashed with Merlin after purchase so didn't tested it was on Asus firmware no closed sources around router only tv nearby 2.4 wifi works just drops connection with internet router still connected and also on 5 mhz everything fine
RT-AC86U fresh install hard reboot with WPS and manual configuration. WiFi separated between 2.4 and 5 MHz plus 2.4 MHz guest network only DNS added and VPN as server and clients configured. After couple hours loosing internet connectivity on 2.4 WiFi network and guest network showed on...