I doubt it's RF interference from something like christmas lights at those specific intervals for 17 months. Also, the author did provide DOCSIS diagnostic logs.

Even if it is RF interference, the problem is at the node level (because his neighbor has the same issues at the same times). So it's not his responsibility to figure out the problem for Xfinity.

Starlink is not an equivalent solution. It's much slower than his requirements, for one.