I was playing with the dimmer yesterday. It seems to be a bit erratic. If I change the setting step-by-step from 0 to 100, it doesn't always get brighter with each step. When I get to 100%, it's not full brightness. Hitting the right button a few more times usually turns the brightness up more, but hitting it again may make it come down again.

I suppose the circuit for controlling this is not too reliable... But it doesn't look like a hardware defect to me. It certainly is not related to vibration or knocks on the player.

Armin