@Mark_Wilson
If Sky is your broadband supplier then it it is them that you contact as BT are another ISP like Sky and Openreach don't deal with customer issues.
Try running this line test to see if it finds any faults:
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.
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