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CCS/CC2540: CC2540F256RHAR MCU locked up

Part Number: CC2540


Tool/software: Code Composer Studio

Dear experts,

       I have customer which used our CC2540 in one project, and they have the below issue;

       Recently they are using the bluetooth PCBA module, found the module can`t be connected. Some module can be re-burned to successful connected, but some still failed.

       After analysis of failed module, they suspect the 2540 MCU to be locked which caused to burning incompletely. So we just want to know what conditions can cause the MCU to be locked and how to judge the MCU locked?