After upgrade to full fibre, internet keeps going down

[Anton9]

I was upgraded to full fibre less than a week ago - so far the internet has gone down 5 times since then. Including tonight. The second and 4th lights on my router keep turning to red. This evening I have switched off the router at the wall - waited a minute - then switched back on again. Eventually all 4 lights turned green and my broadband was returned. It only lasted half an hour - the second and 4th lights on the router are red again. I can't find a phone number to call. This is extremely frustrating, 

[caesarome]

@Anton9 

Try running the line test here to see if any faults are found:
https://www.sky.com/help/articles/broadband-diagnostic-start

You can also run the test via the MySky app on a mobile data connection.

After this has finished and if it reports back all is good click on broadband to run an updated test. If you get amber or red please follow the on screen instructions.

If this is of no help give Sky a call to report it to them.