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LM5013: Soft Start on a Re-start

Part Number: LM5013

Hello,

I observe an issue with the LM5013 in simulation.  Soft start operates as expected on the inital power-up ramp.  Soft start time about 3.5ms.  I disable the device for ~1-2ms then re-enable it.  The device will not start switching again until the feedback voltage decays to approx.  500-600mV (another ~1-2ms).  Why is this?  Shouldn't it immediately begin switching in soft-start mode when I re-enable?  Is there some internal delay or a comparator that is preventing immediate re-start?