Hourly disconnects: steam auth ticket canceled

I have noticed that server freezes (about?) every time the clock reaches a new hour. For example, when it turns 5:00 AM, the server freezes, shows up the auto-reconnect window, and then lose connection (if you don't close the reconnect window). I close the reconnect window and wait till it regains connection to the server. I have only tested this on server 2.

Here are some screenshots I've gathered:

Spoiler

^01/31/2015 - 5:01 PM (don't remember what server)

^02/01/2015 - 3:00 AM (server 2)

^02/01/2015 - 4:00 AM (server 2)

^02/01/2015 - 5:00 AM (server 2)

^02/01/2015 - 6:00 AM (server 2)

 

Looks like it requests a full game update every hour. I've noticed this too a few times but not to this detail. I assumed that someone restarted the server for some reason each time it happened.