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TPS54218: Device does not wake up correctly at cold temperatures

Part Number: TPS54218

Dear Team,

My customer is using the TPS54128 to generate Vout of 1.8V

When he try to start the device at -40degC the devices wakes up with wrong and jittering freq (this is the same case at -30degC).

Do you have any idea what might be causing this ?

The output compensation he uses is R=14.7Kohm ; C=1.5nF as in figure 31 on the datasheet

C_SS=15nF ; RT/CLK=187Kohm.

Regards,

Nir