Mi desk lamp problem with no light control?

I’ve been using Mi desk Lamp Pro for months. However, there has been a problem recently. No matter how many times you turn the button, you can’t control the brightness. There is no problem turning the power on and off, but the brightness is not controlled at all except for the two colors shown in the figure above.
I can’t control it even if I use the Mihome application…
If anyone knows how to solve this problem, I would appreciate it if you could help me.