Hi @Charlotte173 In the past when this has happened to me I find the following gets me reconnected:
Put Glass to Standby and then unplug both your Glass TV and router. Leave for a couple of minutes and then plug your router back in and wait for it to finish rebooting. Once it has rebooted plug your glass TV back in and when that has also rebooted it should have reconnected to the internet.
If that doesn't resolve the issue then have a look at the following link:
https://www.sky.com/help/articles/sky-glass-no-internet-connection-osm
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