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LTC2928 ON pin behavior

Hi there,

I am having an issue with the LTC2928CUHF. I have channel 4 disabled by tying RT4 and V4 to GND. 

1)  Occasionally I get FLT_N asserted (low) and the CMP1-4 pins reporting a command fault, apparently on channel 4. Is channel 4 involved or should I ignore those pins? 

CMP1: high
CMP2: low
CMP3: high
CMP4: high

2) Is there any circumstance where the ON pin will be driven to GND by the LTC2928?



* This image looks blurry in the editor so I don't know if it appears correctly.