ModemManager Process is shutting down

[ratnavel]

HI Aleksander,

ModemManager 1.10.8 on Ubuntu 16.04.4 LTS.
Sierra Wireless EM74xx modem

I had a test where I set the APN as invalid in the modem.
After a few hours, the ModemManager daemon restarted owing to the following
error.

dbus[1001]: [system] Activating via systemd: service
name='org.freedesktop.ModemManager1'
unit='dbus-org.freedesktop.ModemManager1.service'
dbus[1001]: [system] Activation via systemd failed for unit
'dbus-org.freedesktop.ModemManager1.service': Unit
dbus-org.freedesktop.ModemManager1.service not found.

Though the dbus file is present.

Can you let me know on what could possibly be the issue here ?

Thanks,
Ratnavel
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