Still getting packet drops after exhausting everything I can do

This is a followup from my post from more than a month ago. https://forums.xfinity.com/t5/Your-Home-Network/Mysterious-amp-Frustrating-Intermittent-Packet-Loss-amp/td-p/3417384 I'm reposting, because I cannot figure out any way to message a Comcast employee anymore ever since the forum upgrade.

I have done all I could on my part. I've made a new coax outlet right in the garage, right behind the cable TV box, using new coax cables, and wired my house using Ethernet cables all the way. The issue went away for a week or two, but now, unfortunately, I'm once again getting an unacceptable amount of packet loss, and they again correlate with "MDD message timeout" errors on the modem. This has become intolerable for me. Please, could I ask Comcast to replace the drop (I'm assuming that means the coax cable from the tap to my house)?

THANK YOU!!