If your Spawned Sound stops playing when you leave the audible radius you may need to change the Sound Cue Virtualization settings.
Open your Sound Cue
In Details: Find the Voice Management Tab → Virtualization Mode
If this is set to Restart or Disabled this is your problem
Set this to: Play When Silent
This is no longer a question. I tried searching for this and received incredibly irrelevant results. Hopefully this is helpful to someone.
Sounds Disappears. Blueprint Sound Cue isn’t playing anymore. Returning to Sound Cue and it’s not playing. Spawned Sound only plays once. Can’t make sound keep playing.