This is an Android data safety & security feature warning the end user that something or someone has compromised the data integrity of the device. There are several possible reasons why this happened. A) A malfunction of the Operating System, B) a failed Over-the-Air firmware update. C) a bug in the EMM, D) a silent hardware failure; or E) a malicious app trying to gain root access to the device. There is no official fix to this, so to resolve, it would be best to follow these steps: 1. Reboot your device; 2. Factory Data Reset and if that does not work, 3. Send your device to the Sonim Service Center for hardware inspection and a manual re-flash of the firmware.