Hi @Vicgurt ,
Realistically, I think we can infer the timeline of events from this thread even though the root cause of the issue isn't currently clear.
You previously had standard ADSL and upgraded to Fibre 36 which uses VDSL and required some work in a local cabinet to move to FTTC. The service you chose is at the transition point where it can be provided by either FTTC or FTTP but the online information suggests your property has not yet gone up to FTTP (therefore no OpenReach ONT has yet been installed) notwithstanding the message "Detect and configure Ethernet port1 as WAN".
After the upgrade and the supply of an EE Smart Hub, within roughly two weeks, you noticed frequent drops of internet access despite devices remaining connected to the router and you rebooted your router to re-establish internet services. To debug the situation you borrowed a BT Hub 6 which was marketed as the BT Smart Hub (I know because I still have mine and it is marked BT Hub 6 as expected) and found that it maintained internet access for longer periods but still dropped internet services frequently. I'm pretty sure you've only been using the routers one at a time and cabling properly to the master socket.
You didn't at the time know that the authentication details for the BT Smart Hub/BT Hub 6 were different from the EE Smart Hub and the community up to this point wouldn't have expected the BT Smart Hub to work on EE's network but you've found that it does. I judge that the EE Smart Hub is too new (roughly two weeks out of the box) to be able to expect that it is faulty and the BT Smart Hub test also suggests any issue lies elsewhere other than the router. Despite this, it is no bad thing to confirm the same service drops with the new replacement router you will receive.
I feel that ball is in EE's court to diagnose where the upgrade to Fibre 36 has gone wrong and to make it right. There are many online reports of the BT Smart Hub and EE Smart Hub dropping connections although I feel there is insufficient data to blame any router in your case. The service provider should be competent enough to check the physical line and perhaps might move you up to FTTP if they cannot fix the FTTC configuration.
Realistically, your best play would be to enquire about compensation from EE as I can imagine this will be highly inconvenient to yourself and your family, and to ask how they can provide stable internet access for your property as you await a fix (e.g. they could provide a 4GEE router and service free of charge for the duration). https://www.ofcom.org.uk/phones-telecoms-and-internet/advice-for-consumers/costs-and-billing/automat...
TR-069 is a protocol for the managing of equipment on a consumer's premises (i.e. the routers supplied to customers) and either it works ok or there's nothing a customer can really do to debug its operation. There's nothing obviously wrong with the TR69 output shown above. That it correlates with a service drop might mean something to OpenReach or to EE so hopefully they will see if the service drop times correlate with anything in their own logs. Hope EE get things sorted for you! (I use 4G LTE mobile broadband so have exchanged such issues for other equivalent issues.)
