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TMS5701203-Q1: flash470 erase/ program routine failed

Part Number: TMS5701203-Q1

We have received a 0km failure of ESP unit. the unit is failed as no communication. 

we did JTAG test for the MCU (probing on the PCBA). the result is Error 142 - Erase routine failed, Error 151 - Program routine failed. 

but if we remove the MCU to TI evaluation board and retest the MCU (same test program) the issue will disappear. 

what can be the reason of it? and what should we do for improvement?