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Removing the 3G USB modem and inserting it again, rebooting pfsense, Turning pfSense OFF/ON, … did NOT resolve this issue
Here is what worked for me (at least for now)
Under INTERFACES | (ASSIGN) | PPPs | SHOW ADVANCED OPTIONS I changed the following
Set SIM PIN wait to "3"
Put a check mark in Uptime Logging
Put a check mark in Dial On Demand
Regards,