Hi @Anonymous User
I would be tempted to switch the power off to your Router and TV by unplugging it at the mains outlet for a minute, restart the Router (give it 5 minutes where hopefully the three green lights will show again, then switch back on your television).
Mine seems to go off and on every night after 8pm. Can't call them then either to moan. Very frustrating, assumed that was what was happening again. But it has been down since 7 here! Nightmares.