Just noticed this, when I'm watching a video and the phone is rotated clockwise landscape (as in the charging port is on the left), adjusting the volume switches the left and right channels around. If I rotate it back to portrait it stays switched around but then if I rotate it back clockwise landscape it switches back to the right way until I adjust the volume again.
This doesn't happen at all if the phone is rotated anti-clockwise landscape.
Not sure if this happened on A10.
This is the video I was using to check this
https://www.youtube.com/watch?v=6TWJaFD6R2s