Hi @TnG and welcome to the forum. I know you have already tried rebooting your stream puck as well as your router and what I am going to suggest is not dissimilar but it has always worked for me when I lost network/internet connection.
Put your puck into Standby and then unplug both your puck 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 puck back in and when that has also rebooted it should have reconnected to the network & internet
If that doesn't resolve the issue then have a look at the following links to see if they help:
https://www.sky.com/help/articles/sky-glass-no-internet-connection-osm
https://www.sky.com/help/articles/connect-devices-to-broadband-start
------------------------------------------
If my post has solved your issue please mark as an "Answer" as it helps others identify the solution
If it has helped please give it a "Like"
