the disruptions are from labor shortages - which have a variety of causes - that is making it difficult to keep up with the shipping transaction demand you see in the statistics you mentioned.
“In a more recent survey, Centerline Drivers found that more than 50 percent of employers were having trouble hiring truckers.”
Many of these customers treat their third-party carriers and those drivers like crap. It doesn't surprise me that trucking rates are going through the roof, and many of these shippers are having a hard time getting their loads picked up.