Every time the archer C6 or modem boots I have to reconfigure and fiddle with setup to get internet. Takes as much as 20 minutes.

I have an Archer C6 connected thru Cable from C6 WAN port to the ONT Fibre Cable modem regular port, and somehow I got it to work

ONT modem IP is 192.168.1.1. subnet mask 255.255.255.0, Lan1 the Cable port 1000 mbps full duplex, local devices 

Archer C6 default 192.168.0.1, in Status: Internet IP Address 192.168.1.103, Subnet Mask 255.255.255.0, Default Gateway 192.168.1.1 

In case any of the devices / connectors is disconnected / powered off or rebooted it is a huge exercise to get it to work again. I have to re-enter and re-setup the C6.

I tried putting all off then

A. after 1 minute powered on the ONT modem (Nokia-G-140w-c with wifi / radio turned off), after that it takes 1 more minute for its 4 lights other than wifi to be steady

B. after a further 3 minutes powered on the C6, I waited for 10 minutes. while the first 3 lights came on, the 5th light for internet only blinked at low intervals. it never becomes steady.

Ultimately i entered setup and reconfigure, it detects Dynamic IP (sometimes it does not and just says WAN port is unplugged) and then i proceed to create the SSID and Password). at the end it says failed with an elaborate message - after a couple of attempts the 5th light comes on and internets starts working.

this is very painful.