20-year customer + 9-month of stuttering broadcast

I've had an ongoing cable broadcast issue of intermittent stuttering audio and video. I've called, complained, gone through all the steps, and I've changed out my box. I've spoken to numerous representatives and I have explained the issue over and over. I've been 'disconnected' numerous times after going through the phone tree again and again. At times, I've been apathetic to the problem, but it persists. The cost for my services is over 3K and I wouldn't think that the person reading this would think this is acceptable.

I've attempted to escalate the problem over the phone and no one seems to be able to connect me to the proper representative. 

The issue is external hardware or stuttering cable is what Xfinity is now. After over 20 years with Comcast I am near done.