Today I was playing Twilight Princess on my Wii U. I was in the last part when Ganondorf is a pig and you need yo chase him around... Anyway after a few minutes I couldn't hear anything! I was surprised and thought it could be an effect from the game, but I heard absolutely nothing. i pressed the home button on my Wii Mote but no sound. I even turned up the volume even more on my TV to be sure (it wasn't muted). Went to the Wii Menu, still nothing. i booted up the Wii U menu through the Wii menu (too many Wii's 
) and the sound was back! I wanted to keep playing so I inserted the disc again (I removed it after booting up the Wii U menu), went to Wii mode and finished the game. 
So emotional... Everything worked fine, the sound was perfect , but I'm afraid it may happen again. This had never happened in any sort way so I'm kind of confused. Any idea of what could'vd happened? Was it a glitch? Should i be worried?
Well thanks for taking your time to read this.