LTM4650A Can not work normally

hello:

There are two pieces of LTM4650A-1 on my circuit, input 12V, output 0.85V. The two circuits are the same, and one is not working properly.
Sometimes the power is suddenly lost, and sometimes it cannot be started.
When unable to start or power down, the various states are as follows
Vout:0.99V or 1.5V
Good:0V
INTVCC:5V
RUN:3.8V
VFB:0V

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