Okay, it seems there may be a sound issue. Now we need to isolate which sound file.
So, can you go through a binary search to isolate which file causes the issue by:
1) Remove half the sounds to a Hold folder. Test
2) If problem disappears, the issue is in the removed sounds, so put those sounds back in and remove the others.
3) Now, remove half of those sounds and test.
Continue to isolate until you are down to 1 file. Of course there is a possibility that a combination of sounds are required to cause the issue.
But, when you are down to one file left, remove it and put all the others back in the folder and test again to be sure the problem is gone.