Caribbean Steel Drum patch stops sending audio after playing for a few seconds

I am playing a set on MainStage, and I have a patch with Caribbean Steel Drums (World/Percussion/Caribbean Steel Drums), and after playing sounds from that patch for approximately 5-15 seconds, it just stops exporting audio from the channel. It also doesn't even recognize that MIDI is being played into the patch. I haven't modified any settings from the default patch. What is happening?