Comcast Rolling Outages

I recently saw this on Facebook: BREAKING: Some Xfinity/Comcast users are getting a message in the Chicago and Springfield, Illinois markets that they are shutting down Internet service until 11:15 PM this evening due to overheating equipment... Update: some areas are doing rolling outages. Are rolling outages due to heat something common for ISPs to do? I've never heard of it for any of the hundreds of ISPs I've talked to. ----- Mike Hammett Intelligent Computing Solutions Midwest Internet Exchange The Brothers WISP