SK6812 WWA Leds issue

Hello guys. I just get some SK6812 WWA prewired Leds. When I try the pixelblaze I get some rare flickering. I try resoldering all the connections, try another pixelblaze the same. Change settings to differents kinds of Leds, RGB selected because this is a 3 chip Led. They dont work when I select apa. Change the speed. Always the same. Then I try a sp110 Led controller and no problem. Smooth changing colors. Any idea? Thanks in advantage.

Hi @Changchung,
Try different speed settings, and be sure to use the buffered type for WS2812.