Anyone else having connectivity issues, cycling from four bars to SOS mode constantly?

Hi All - 

I've had Verizon for years, an iPhone 8, work from home, and have never had any issues with Verizon (Xfinity Mobile) where I live. I shifted to Xfinity Mobile well over a year ago.  About two months ago I noticed my phone began to cycle in connectivity every couple hours, from 4 bars to SOS mode, also found calls were not coming in (intermittent), notifications for voice mails the following day, and text messages seriously delayed.  The only way to correct this was to restart the phone.  Thinking it might be iOS 16, I downgraded to 15.6, with no change.  Reset the network settings, no change.  I own 4 iPhones of differing vintages, 6 Plus, 7, SE (2nd gen) and the 8.  I moved the SIM to each phone, the behavior followed.  At that point I assumed the issue was the SIM, and after a brief struggle with Xfinity I received a replacement Monday, January 30.  To my chagrin, it is not the SIM card after all, the behavior persists with the new SIM card in all four phones.

This indicates to me a network issue, not a phone or SIM issue.  Online there are NUMEROUS threads of similar experiences with individuals who had no previous issues seeing the same behavior.  As a small business owner this is more than problematic, calling tech support will be of no help.  Is Verizon, and by extension, Xfinity, aware of this?  Can anyone shed some light on this?  If I can't find a resolution I'm going to have to shift providers, and relatively quickly, as this is impacting day-to-day operations which I can't afford.