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LT3752+LT8311 Cold start issue

Hi 

I have use LT3752+LT8311 for 9V~36V to 12V/12A (like DC2175A).

Now we can't start up when -30degreeC in chamber, That doesn’t happen continuously, but can be copied by freezer spray at pulse transformer. (Coilcraft CV9052-AL)

it will cause some noise on LT8311 Sync pin when cold temp, so I would like to know the pulse transformer select limitation, is it must be PULSE PE-68386NL???