Do you live in a climate with high humidity? My 2011 has emitted that noise twice now. Both times it was very humid for a long period of time, once after a full day of rain and once overnight when there was dew/moisture everywhere. Once I drive it awhile it goes away. This happened to me with a Toyota Celica GT-S; the belt tensioners had to be replaced twice before it went away. You might want to explore that. Good luck!
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