EG95-NA Config self reset?

I have several stations that have a RAK2013 from RakWireless which uses an EG95-NA 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 serial port connection 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 and how can I prevent it? The unit has been deployed for over a year and has had no issues until this weekend. Thanks for any thoughts on this.