I've just completely defaulted my RT-AC68U due to numerous disconnection issues with any firmware since 3004-378-4585. I've also used the Merlin 380.57 version and getting some strange log events, something that I've not seen before and wonder what it is thats causing it. I also have a RT-N66U and using it as a Repeater.
Feb 21 15:04:18 dnsmasq-dhcp[9541]: DHCPDISCOVER(br0) xx:xx:xx:xx:xx:17
Feb 21 15:04:18 dnsmasq-dhcp[9541]: DHCPOFFER(br0) 192.168.1.16 xx:xx:xx:xx:xx:17
Feb 21 15:04:18...
RT-AC68U DHCPREQUEST(br0) DHCPACK(br0) ???
Feb 21 15:04:18 dnsmasq-dhcp[9541]: DHCPDISCOVER(br0) xx:xx:xx:xx:xx:17
Feb 21 15:04:18 dnsmasq-dhcp[9541]: DHCPOFFER(br0) 192.168.1.16 xx:xx:xx:xx:xx:17
Feb 21 15:04:18...
RT-AC68U DHCPREQUEST(br0) DHCPACK(br0) ???