I have a Nexus 7 2012 android 5.1.1 and I get sound distortion after several hours of nature sound played at night. It has happened with several apps, like TaoMix and Rain Sounds, while the device is connected to Denon speakers or not, I wake up to a big sound distortion. Anyone else experience this? Could it be related to the unsafe sound levels problem? Please take a look at a recording of this problem.