Note At End of Playlist Reg Does Not Stop

[Reg]

   I'm wondering if anyone has encountered this problem.  I played a file(reg) from the bonus playlist.  At the end, one note continued to sound and I was unable to stop it.  Fortunately I was able to open another registration and the sound was gone. I then returned to the registration I had been using and  everything was fine.
   It may sound like a minor issue  but it   is disturbing to think it might  occur in a performance.