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TPS62170-Q1: Abnormal SW waveform happened intermittently

Part Number: TPS62170-Q1

Hi, we built 20 samples of car camera this week, and found one piece sample the SW waveform is abnormal during power up (refer to Vsw in Figure 1). This symptom can be disappeared (refer to Figure 2) when we wait for a few seconds or tune down the input voltage from 5V to 3.5V, Our application conditions are as following, could you help check the possible cause.      ~Many Thinks. 

Application Conditions: Input Volt: 5V, Output Volt: 1.8V, load current: 240mA

Schematic:

Figure 1: abnormal SW waveform

    

Figure 2: normal SW waveform