I've got an NPR fighting it out with Precursors in a nebula, and it's dropped down to 5sec increments due to "imminent action". Looking at the event log, I see a bunch of "can't fire missiles in Nebula" messages for the Precursors. I suspect, but am not sure, that the Precursor "imminent action" check is looking at missiles and thinking that the NPR is within firing range. Note that the NPR is within beam range, but not fire control range, of the Precursors (meaning the Precursors have the range to fire at them, but not the fire control), so this might also be contributing to the mix.
John