Why does my speaker output balance keep changing?

Hi,
I've noticed that every now and again, the output balance for the speakers on my MacBook Pro (13-inch, retina display, early 2013) keeps changing randomly and shifting to the left channel.
This is really frustrating since never change it manually, and often use my Mac to listen to music/watch films etc. Obviously it's not a big issue to change (done easily through System Preferences) but it would be good to know why it keeps changing in the first place!

try this.http://support.apple.com/en-us/HT204063   http://support.apple.com/da-dk/HT3964

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