https://www.cnet.com/news/testing-verizons-early-5g-speeds-3-major-issues-with-the-next-gen-data-network-and-how-to-fix-them/

At times, the 5G speeds recorded by the Speedtest.net benchmarking test got us the 600-plus megabits per second download speeds Verizon has promised (my peak speed was 634Mbps). Other times it was closer to 200Mbps, and still other times, the phone professed to be on 5G, but acted a lot like 4G. I had a battalion of upload and download tests I was going to try Thursday in downtown Chicago, but it was so hard to keep a 5G connection long enough to run the most basic tests, I had to throw those plans out the window. 

Verizon and Motorola are well aware of these issues. I spent hours with PR reps from both companies, and kept in close contact with them throughout the day. They both acknowledged the start-up issues and said that engineers were following up with trouble locations.