Can't Establish Connection - Motorola MB8611 Modem

OK, solution required a tech to come out. He checked connectivity and found poor values for down and uplink. After following the cable, it turned out that there was a sharp bend at a connection point. 

Going from 800mb to 1gb had increased the sensitivity of my cable to any disruption, so returning to 800mb had briefly helped me with service, but the real problem was the kink in the cable near the drop.

@XfinityJosephB Yes, I did try other lines in the house without success. I had been concerned some poor cabling by me or a handyman had caused the issue, and while some of those did get replaced, the problem originated outside of my house/equipment.

@jakwagner As mentioned, the outcome for me was a kinked cable near the drop. All the corrected and uncorrected packets that were visible in the modem connection settings were a result of a physical issue that was outside of my house. The drop is actually in my neighbors yard, so the tech had to go over to their house to resolve the issue.

Final resolution will be done when more Xfinity employees come out and actually bury the cable properly. The root cause was an exposed cable that got bent because it was exposed, so until it is buried the problem could reemerge.

Also, there was nothing I could have done as it relates to my house, cabling, equipment, or settings. In my case, this ended up being an external issue. It could have been local if the cable problem had been in my house somewhere, but in my case it was not.

Hope this is helpful to others!