Some buttons stick out of the device on one side (as they should) and on the other side they disappear into the device and are below the surface. See photo: Here, for example, the left side of the "Note Mode" button is below the surface and the right side is sticking out normally as expected. With the arrow buttons (above) it is similar, but not quite as extreme as with the Note Mode button.
In addition, the play button squeaks and rubs against the housing when I press it.
Is this also the case with your P3 (standalone)?
