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DS90UB926Q-Q1: lock signal

Part Number: DS90UB926Q-Q1

hi team

when use the DS90UB926Q-Q1, it was discovered that the LOCK signal would randomly fall early during power loss and would drop along with the power supply during normal power down without falling early. Have investigated the PDB/SEL/OEN/FPD_link signal and other related pins, confirm that there is no abnormality temporarily, also confirm that the waveform of the live power configuration code IIC is not abnormal, please list all possible scenarios where LOCK will fall prematurely. thanks