Hello, this should be a warranty case... No more light after two days, that's not normal... I have not had a problem so far.
I don't know if the LED lights can be bought separately and replaced, and I would also be very interested. Therefore, I join this question and thank you for an answer from a competent place.
The light colour yes, but not the dimming or the on/off state. When plugged in, the lamp is always dark and you switch one level higher with each click: On -> Level 1 - 2 - 3 -> Off.