9:10 AM -- Cable modem service uptime has hit a rough patch in recent weeks.

Following an outage on the eve of "Cyber Monday" in Boston, Washington, and Baltimore, Comcast Corp. (Nasdaq: CMCSA, CMCSK)'s customer care Twitter account and news reports were relaying information Sunday night about another significant high-speed Internet service outage, this time hitting MSO systems serving Chicago, Indiana, Michigan, and Minnesota.

The ComcastCares Twitter account stated that the problem was related to DNS servers, also believed to be the culprit of the Nov. 29 outage on the East coast. Comcast began the process of migrating to DNS servers outfitted with Domain Name System Security Extensions (DNSSEC) back in October as part of its beefed-up Internet 'bot-detection and notification service. (See Comcast Goes Wide With PC Security Bot.)

Both outages occurred on Sunday evenings. (See Comcast Hit by Regional Net Outage .)

The latest outage reportedly started at 7:30 p.m. Sunday, and was fixed at about midnight.

Last Thursday (Dec. 2), Time Warner Cable Inc. (NYSE: TWC) suffered an Internet service outage that affected about 2 million customers in California.

— Jeff Baumgartner, Site Editor, Light Reading Cable