Re,,, It's a bathroom tv it's about 8 years old it still works fine but it recently started to cause this broadband problem
The wiring regulations in the UK state that:
The use or installation of a sockets is not allowed in bathrooms or shower rooms, unless they can be fitted at least three metres from the bath or shower. The only exception to this is a shaver-supply unit.
Stay alive remove TV from bathroom.
I would think the TV is shorting inside due to the damp air in the bathroom.