Songs fading to black on SC6000

I’ve got a bunch of autoscripted songs that are playing fine start to finish on the desktop version of SoundSwitch, but when I trigger them from Engine Lighting on SC6000’s natively, the lights all gently fade to black at the 3:30-4:00 minute mark of any song that’s longer than that.

Has anyone seen this behavior before? Can’t seem to figure out why that is or how to fix it.