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TPS40422: temperature effect on the loading performance

Part Number: TPS40422

Hi,

I have a TPS40422+CSD87350 two phase design, the target loading is 60A. Attached is the schematic.

when power up with 40A loading, the board works fine, but failed to work with 60A loading.

I tried a lot check with component, soldering issue, but no improve. then I found after I heat the board to a level like above 40 degree Celsius. the board works.

So, what is the root cause for the board fail? and why the pre-heat can make it work? is there any issue with my schematic design?Power Sch.pdf