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LM61460-Q1: Questions about 'EN' of LM61460AASQRJRRQ1

Part Number: LM61460-Q1

Hi,

 We are designing an automotive ECU and using LM61460AASQRJRRQ1. It is used to convert 12V to 3.3V as the primary power supply.  However we find something strange when we do the electrical performance experiments.  

1. We apply the pulse below to 'VIN' for 10 times. Sometimes the output voltage will begin to decrease when 'EN' reaches 850mV (see graph 1)and sometimes not, even 'EN' reaches 833mV (see graph 2). If we use the same board, the EN threshold should be fixed and the same, right? 

Ours design: The voltage applied to EN is divided from VIN.

Pulse:

Graph 1

Graph 2

 2. We only find the turn on delay of EN, but can't find the time from EN low to output turns off. Could you provide it for us?