11-28-2021, 07:29 AM
I did more work on it and I believe that I have narrowed it down to a hardware issue. The modem has possibly been jostled loose from an impact. Manually maneuvering it appears to fix it and tapping the phone appears to cause the modem to drop. Not sure if the error message from ModemManager makes sense with this, but it seems to be fairly consistent when I manipulate it.