Started Unicast Maintenance Ranging - No Response received - T3 time-out

There is a fundamental flaw with the cable company dogma that we see repeated here.

In my case, and in others reported here, the events are clustered in time. There is no connection flaw mechanism that would lead to time-related drop-outs.  However, a problem related to congestion and problems at the upstream end in dealing with congestion would explain time dependence. 

The problem with having a Cox technician examine the problem at the customer end is that he will never find the problem if it is some sort of congestion issue. 

I believe that Cox knows exactly what the problem is, and is not telling us because they do not want to spend the time and money to fix it.

But maybe I am wrong and Dave's explanation that these problems are all unrelated coincidences having nothing to do with each other is the answer.