It's back after 20 days router is losing synch every hour.
http://community.talktalk.co.uk/t5/Superpowered-Fibre-Broadband/Loss-of-synch/m-p/1878157
http://community.talktalk.co.uk/t5/Superpowered-Fibre-Broadband/Loss-of-synch/m-p/1878157