This was a good read and I am curious if I am experiencing something similar. I have noticed some signal issues on all of my ATSC 3.0 stations. I am in the Nashville area. The signal seems decent. I just hope it is not a problem with the device itself. I am using a Connect 4K.
I figure I will add additional information that was provided in previous posts to make troubleshooting quicker. I am located in zip code 37067
This is the antenna I am currently using and it is mounted in a window facing north towards all the stations.
https://www.amazon.com/gp/product/B07H1 ... UTF8&psc=1
Due to the current antenna delaminating I bought a new one to install in the attic facing the same direction.
https://www.amazon.com/gp/product/B01MY ... UTF8&psc=1
I also purchased a signal booster to go along with it.
Reception, channel detection, network issues, CableCARD setup, etc.