Modem Config Reset on its own

I have several stations that have a RAK2013 with a bridged network to a LAN over ethernet. Yesterday I had a unit go down and was not accessible remotely. I had a tech bring the unit in and from what I can tell the modem had returned back to stock setting. I run the tty at 921600 baud and also set the MBN file to autoselect. When I first logged into the unit and connected to the serial port the modem was running at 115200. I reset the baud to the intended speed and then I had to reconfigure the MBN before i could successfully dial Verizon again.

Is this something that happens? The unit has been deployed for over a year and has had no issues. Should I reach out to Qeuctel instead? Maybe they have a better insight. Thanks for any thoughts on this.