Hi there @rhydianbevan2
Thank you so much for your first post to our community forums and welcome to the team! It's great to have you here!
I'm so sorry to hear that you are facing this issue with your TV box!
I know that this is the TV that wish to use, but are you able to try the box with another TV so we can better understand what may be causing this?
Also can you let us know what the engineer have said when they visited?
Thank you.