I have the same problem. Can't make or receive phone calls. Same phone. Moto g7. Update is Android 10, Version QPU30.52-23. Security patch level: April 1, 2020.
Clesky, we know how much of an inconvenience it can be to experience a fluctuating or loss of signal, and we want to fix this. In order to better assist you, can you please provide the nearest intersection and zip code for the last location this issue occurred? How is your experience with sending or receiving text messages and using data without a Wi-Fi connection?