My MOTO G4 PLUS is really giving me trouble!!! It started out with "CommServer has started" then I lost service. SO I tried to reboot, and now its frozen on the power off screen. Ive only had this phone for 3-4 months - NOT IMPRESSED!
The "CommServer has started" message appears to point to a charging problem, more specifically, the charger itself. If you have access to another wall charger, this should correct the problem. Or you can try charging the phone from a USB port on your computer, though the charge time may take a little longer. Turn the phone off and allow it to charge to full capacity.
Once fully charged, the notification icon and"CommServer has started" message should disappear. (The Moto G4 Plus has a non-removable battery).