My setup is that I have an Orcon modem (NF18ACV) which connects to the ONT.  Behind my modem sits an Orbi router connected to a LAN port on the Orcon modem.  All devices were connected to the Orbi.  On the Orcon Modem, Wi-Fi was disabled.  I have a landline.

Every 3 or 4 days, I loose the ability to connect to the Internet.  The ONT shows 2 green and 1 orange light on solid (usually they are all flashing on and off constantly).  The Orcon modem shows all lights on as usual except the phone light - that is off and there is no dial tone.  The Orbi reports no internet connection with a purple glow light.

When I first reported the problem to Orcon they looked at the router and asked why the Wi-Fi was disabled. When I told them about the Orbi they suggested the problem was caused by the Orbi loosing its connection to the Orcon modem.  At this point I had not noticed the landline status.  The solution is to power-cycle the Orcon modem.  I therefore enabled the Orcon router Wi-Fi but hid the SSIDs.

When the problem happened the next time I noticed the landline was down and tried to connect to one of the Orcon router SSIDs.  With them being hidden could not see the status visually from my laptop and no connection was possible.  I called Orcon and they again insisted the Orbi is the probable cause.  Their requirement is that I disconnect the Orbi completely and report the problem if it occurs again.  This is simply not acceptable to me.  There were many good reasons that I bought the Orbi and I refuse to do without it.  As a compromise I have 'un-hidden' the SSIDs for the Orcon modem and moved my phone to it so there is at least one device connected.  I know this does not meet the Orcon requirement but if that phone is not operable when the problem occurs then it indicates a problem with the modem, not the Orbi.  I do not understand what the Orbi could do to the Orcon router to induce a complete failure but I acknowledge the possibilityas a theory.

When the problem happens again I will check the landline status and I will check if the phone connected to the Orcon modem Wi-Fi has any usable service.  I am expecting that the landline will indeed be down and there will be no data available through the Orcon modem Wi-Fi.  To me this would conclusively prove that the Orbi is not the cause of the problem - that the problem is either with the ONT or the Orcon modem.  I would appreciate any assistance in dealing with the expected response from Orcon blaming the Orbi.

Background info:

I have had the Orbi now for some years, originally connected to an NF4V that predated the NF18ACV.  When I originally installed the NF18ACV I was an ADSL user.  Fibre was installed last March and the problem started to occur some time after the Fibre upgrade was done.  I dont have log records that would be needed to tie the start of this problem to the Fibre upgrade.

I have a network printer/scanner connected to the Orbi which is used daily to scan and store documents on our various devices.  Devices connected to the Orcon modem Wi-Fi cannot 'see' devices connected to the Orbi.  The quality of the Wi-Fi network on the Orcon modem is not good enough for me to move all devices to the Orcon modem and turn off the Orbi.  I don't have any option to use wired (LAN) connections except as a temporary measure.