Welcome to our Community and thanks so much for your first post - sorry that you seem to be having some issues with your broadband at the moment.
We can see a few areas of latency from your BQM chart you provided - I've located your details from your forum information and have been able to take a closer look at your services from here.
Currently we have no known area issues, your levels are within the parameters that we would expect and there are no errors showing on the Hub3 that we can see today. I can see that you rebooted the Hub around 36 hours ago.
I understand that you have advised that you have tested wired connection direct to the Hub; we can see that you currently have quite a few devices connected over Ethernet and we can see numerous other WiFi devices connected too; one of which is causing some issues.
Are you able to disconnect all WiFi devices and connect just one device wired for us to see if you have any improvement? We can then go from there.
I can certainly do that, two new devices in the form of a work laptop (Which wouldnt account for anything over the passed 24-36 hours as it's been off) and the new S20+ samsung phone have been introduced to the network.
I did switch the router over to modem mode FYI and had little to no joy as well? Is there no way to tell on your end what device that is? (I'm assuming not)