I think half the problem on WiFi is simply because VM routers have the aerials internal and against other noisy electronics, where as "proper" access points normally have external aerials and thus are isolated more from other electronics.
As a case in point, I tried a Ring doorbell with the VM hub and the doorbell was sporadic - it would miss movement and sometimes even doorbell pushes, looking into the diagnostics said it had a signal strength of -85 to -90, now with an external router in the same position it gets -60 which is far better and is no longer intermittent.
So if you just WiFi for emails and web browsing the included router is fine - but if you depend on WiFi for anything more than that you should invest in a better router and put the VM box into modem mode.
I have tried posting broadband quality monitoring graphs. They haven't appeared despite removing personal details.
How do I get the logs you mention?
Pictures have to be approved by the VM Mods, so they take a while to appear.
For the logs etc, log onto the Hub at 192.168.0.1 and for the Hub 4 I think it's under the Advanced tab somewhere. I don't have one, so not sure. Just copy and paste into the message and don't worry about invalid HTML messages, just continue and the Board software will remove the problems and post anyway.
They should be separate tabs, Downstream and Upstream? Just reading the logs and you are getting T3 timeouts and Loss of Sync, so something is amiss with the circuit. If we can see the Downstream and Upstream power levels we can comment further.