Welcome to the forums and thanks for your post - I'm very sorry to hear that you have been experiencing these TV issues for so long and our faults teams haven't helped you. Thanks @japitts for flagging this for us, this is something I try and resolve for you.
I'll need to pass some security with you in order to do so, so I'll send you a private message for this. Look out for the purple envelope at the top of the page.
May I also ask in the meantime that you give both your TV box and Hub a reboot for me and keep these switched on.