Problems with K8064

Hi
it is my 4th K8064 and I have trouble with this one.

It is flickering like a “candel-bulb” (the bulb)

I can dim the light but on 100% it is flickering (but not so much)
On 100% the the light is not on full power.

When I dim the light up the flikering is more.
On 0% the light is down without flickering.
On 10% the flickering is the strongest.
The analog input voltage is stable. I have checked it with a capacitor at the input.
The load is 15 watts. A normal bulb.

What can I do ?

Best regards

Load is too small.
We’d recommend at least 40-60W