Well it appears I spoke too soon. Comcast, in Macomb County Michigan area, continues to interrupt their cable modem service on a daily basis! Sometimes several times a day. Usually the interruptions are short lived, but they are still a pain. I've pulled the plug on my cable modems power supply so many times, I'm surprised it hasn't worn out. It seem they must be re-booting their servers when ever they want to try something out. Either that, or they have a disgruntled employee just playing with it!
It's not on my end, as all my neighbors, and many friends in other nearby areas are experiencing the same interruptions. Time to start a log, and request a pro-rated credit to my account. I only wished I had done so a lot sooner. This has been going on for several months now.