An issue with LT3762-based boost converter. The .asc file included

Dear colleagues,

Is it possible to use for LT3762 VIN a voltage supply that is lower than the main input voltage of the boost converter?

I have the successful LTSpice simulation but the live circuit stood working for a few seconds only, from an external PWM of 40%.

After that is happened, PWMTG signal do not starting permanently even after the power OFF then ON. 

Nothing was heated noticeably. BG and TG signals are continuing work normally.

May different power sources for VIN and rest of the circuit be the cause for the issue?

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