I think it's more on the O failures in the second half than the D collapsing. I understand than you don't make adjustments when things are working, like they did in the first half.
But you DO make adjustments when those things you were doing stop working. I know that's simplistic, but it sure looks like the D coordinators for the last five teams we played totally skunked Chud. Some of that is on the players not executing, but he has to be ready with alternative game plans.
By now, it's more than a coincidence, it's a pattern. And it has to stop!