See how long it takes for the 1st episode of 'Drive to Survive' on Netflix for the Atmos to start dropping out. I always suspected that the stream's characteristics were a factor, and that show always starts dropping out within about a minute for me.
I believe that shows with a more active Atmos track are more prone to the Atmos dropouts. Higher bandwidth video streams may also contribute to the problem. This goes beyond just whether or not the material is in 4K and DV, but also how much detail and motion are in the video. This can also vary between different streaming providers, as they can vary the bandwidth based on network conditions and their target compression rates.
Tying that into my belief that the problem is timing or other errors in the creation of the MAT 2.0 Atmos metadata, it would make sense that a busier Atmos track should experience more frequent Atmos issues. All speculation, but my best guess why some shows seem more prone to the Atmos problem than others, at least in my experience.