reourse pack /playsound glitch

Put the summary of the bug you're having here

What I expected to happen was...:
My custom .jason sound would play all the way through whenever I used the /playsound command.

What actually happened was...:
The sound (which is quite long) plays for about 5 - 30 seconds, then randomly stops.

Steps to Reproduce:
1. Open resource pack
2. do /playsound stretch
3. Sound will stop randomly... (this may be because to many other sounds are playing?)