There’s a known bug (or maybe it’s intended, but it’s dumb) where soundcomponents get killed automatically when their volume is 0. There’s a bool, VirtualiseWhenSilent, on SoundCues (or maybe sound waves) that you can try to fix this; but I’m not sure if it works. A workaround would be to only slide the volume down to 0.01 or something. Probably couldn’t tell the difference.