If you have not changed your broadband package then see if you can run this line test to see if a fault is found outside of your property and if something is found you can book an engineer repair, ignore the fact it says it will test your broadband:
https://www.sky.com/help/home/broadband/my-broadband-speed/no-connection-slow-wifi/articles/broadban...
You can also run this test via the MySky app.
Let us know how you get on.
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