Hello 
@Fletch
I’ve checked our server logs and I can see that there has been no outages on our end.
However, I have been alerted that there were a lot of major disconnections for some ISP in Canada from around 12am AEST - 6am AEST.
And currently, Steam is down in both United States and Canada.
I’d suggest checking with your ISPs, and or with websites such as downdetector and looking for any large spikes in reported issues or a big red line signalling that it’s currently down and or in a critically low state.
Thank you for your understanding