Kontakt seems to receive extra note-off events during mixdown in Ableton Live

wayfinder

This only seems to happen when I continue using the computer to do other things while the mixdown is happening - I am not sure what exactly triggers it, haven't been able to pin it down. But sometimes Kontakt tracks turn out to have dropped out in the render when they shouldn't, and I'll have to re-do the mixdown and go completely hands-off for the duration, and it usually then does not have the errant dropouts.

Anyone else ever have that?