Starting in firmware version 23.12.1.56, the watchdog system inside the Digi router will automatically re-power the cellular modem inside the Digi router if the modem is not initialized for more than one hour, and reboot the entire Digi router if the modem is un-initialized for more than 2 hours.  Please read the release notes for information on disabling this option.

 EX15 devices running 23.9.20.67 or older firmware must upgrade to version 23.12.1.56 before upgrading to a newer firmware. Firmware version 23.12.1.56 is a step-firmware image for the EX15 product.