Hi mizzy887,
Thanks for coming back to me via private message with your information.
Our diagnostics on your home network and Hub have not found any issues that could account for the issues you're seeing. The area network segment has no congestion on either.
Given the engineer has also been and advised the same I'm not quite sure where to go with this one.
Can you post your BQM live link so we can monitor this. I can also use this to refer this over to the Area Manager then too.
Speak soon,