A new message on the Steam website has revealed service downtime is planned later this week.
"Beginning at 6pm Pacific time Thursday February 4th, we will be performing software maintenance on some Steam servers," the message reads. "We expect the resulting downtime to last three hours at most, putting the end of the window at 9pm Pacific time." That's 10am - 1pm UK time.
"Some Steam services will be offline during this time. Affected services will include the Steam Community, in-game matchmaking or lobbies, downloading games from Steam content servers, and making purchases from the Steam store." However, you should still be able to play games which don't rely on Steam matchmaking services.
So there you go.
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