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TPS61194: Channel (led string) short circuit fault is not reported at every failure instance

Part Number: TPS61194

In TPS61194, when there is a short circuit (Vout shorted to OUTx),it is observed that fault is not reported all the time.

Test Conditions:

Input Voltage=12v

RIset = 49k

Rfset = 160k

PWM=100%

Feedback: R1= 470k, R2=130k

(Out1,Out2) channels are shorted

Vout= 15V

In my design VDDIO is 1.8V and Fault pin is pulled up to 1.8V through 10k resistor