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Don't worry to much. I'm pointed it just what I noticed. You have temple music loop playing and sometimes loop  breaks. It could be for the number of technical reasons. For example, loop file is mp3. Unity has special DSP clock for music, if it isn't chosen can be problems too,  I made a test video about it 

 You can use middleware like FMOD to make different kind of things with music and sounds with more "stable" result, which has only one downside it's separate API and sometimes it gives trouble. 

But I need to say that it  doesn't ruins game experience and that is the main thing. You have a great game, Don't worry.