Been doing this for a long time and first time setting up a Pixcon16 (I have successfully installed 2 of these) I encounter random pixels changing colors at a fast rate upon startup.
I run the S5 show and pixels respond correctly. However, the random "twinkling" continues when the pixels are to be off.
I am running latest S5, latest firmware for Pixcon16, 12vdc pixels, 2 power supplies to Pixcon16 (one for bank1 channels 1-8) and (one for bank2 channels 9-16).
No power injection. Running Pixcon16 channels at 30% intensity. From Pixcon16 to first pixel is 12'. 150 pixels/channel