I use my headphones while I work and notice after about 4-5 hours of listening that all audio is suddenly transposed to a lower key. This happens across different apps (Spotify, Google Podcasts, YouTube). It's a kind of fun glitch to be able to listen to music and podcasts at a lower range, however I cannot find any forum that talks about this. I have to restart both my headphones and mobile device to get the sound back to normal. Any thoughts on why this happens?