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Taking into account the workaround provided by pva on the freebsd forum post, It may be as simple as creating a custom Monit script for OPNsense for when the interface goes down then "usbconfig reset" command is executed and then the ppp will establish the connection again on it's reconnection attempts.  Will do some testing and let you know if it works out.

This post is old but kinda sounds like the same symptoms, hmm
https://forums.freebsd.org/threads/reset-usb-devices.24738/

I do not think USB itself is a factor nor is it the APN.  I am also encountering the same problem and also with Australia Telstra 4G.  I have a Sierra Wireless MC7304 installed in a z4 Qotom motherboard so I would think that rules out a USB related problem. But yea I am having the same symptoms, works fine after a reboot sometimes even a few days then just stops working.  Seems I am able to jumpstart it back again by going to the ppp configuration in point-to-point and clicking the Save button.  But this workaround only works a few times and then just stops working altogether until I reboot again.  This workaround is still initiated manually which not practical.  I am also looking for something to automatically get it back up after it fails, maybe a script or cron job but need to find out what is actually happening during boot up that enables the 4G to connect without issues and replicate the actions to a script and automate when it goes down.