Hi there, I have a problem with my new ESP8266 HUZZAH board and RGBW NeoPixels. When brightness drops below 80, all pixels start flickering. The more low, the more flickering. I tested both NeoPixelBus and NeoPixelBrightnessBus with both UART and DMA. Everywhere same flickering thing. The same circuit run with the Adafruit library performs well in low brightness. Has anybody encountered a similar issue?