Hey Liam, I spent some time trying to reproduce this today, but haven’t been able to get the same behaviour with any of the modems I have here. It’s pretty strange, I am wondering if perhaps its something to do with the cdma modems as I am based in Europe, so have only ever tested GSM modems. Perhaps @mccollam has had some success with his CDMA based modems.
It’s also interesting to see these two lines:
Mar 06 12:08:13 e5882e6 pppd[856]: Terminating on signal 15
Mar 06 12:08:13 e5882e6 NetworkManager[723]: Terminating on signal 15
Which seem like something is sending SIGTERM to the pppd and NM. This I suspect is the systemd process in your container when it shutdown during a application stop while updating. So perhaps having INITSYSTEM=off will stop the issue from happening?