TPS65252 can not work normally like datasheet!

Customer adopted TPS65252 in one project and shipped 100Kpcs real products, but 10% failed at end customer side.

Fail phenomena:  

Start up  at low temperature, it will works at “PFM” mode, Duty will be “stable” after running for a short time.(waveform and design  in attach file)

PLS  Analyze this case, try to find the root case and solve this issue.

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