Standard Cable - Glitching

I have my Comcast cable delivered through Westminster, Carroll County Maryland

Increasingly I am getting erroneous actions when viewing programs across a wide variety of the channels offered.  Pixilation, Stop Action, Audio & Video are out of sync,  This is happening on some over the air local channels but it also happens on non-OTA cable only channels.  For what my monthly bill Is I expect better and more reliable service.

I have written to one of the OTA stations and got a response from one of their engineers stating that their outgoing signal is stead and synchronized.

[Edited: "Personal Information"]