WS2812B in 10*10 matrix blinken unkontrolliert

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hallo zusammen,
ich habe mir die letzte woche eine 10*10 led matrix aus den ws2812b led gebaut.
angesteuert wird das ganze durch einen arduino nano klon.
jetzt mein problem...
ich habe mir in mein programm die fastled library geladen, die leds leuchten auch fast wie sie sollen.
aber... sobald mehr als ungefähr 40 leds sind, blinken die leds  im rechten block der matrix unkontrolliert in weiß hellblau.
ich habe schon mehrere der digitalen pins ausprobiert, doch immer das selbe problem.
als netzteil benutze ich ein 5v 4a netzteil.
hatte schonmal jemand ein problem? oder kann mir jemand helfen das problem zu fixen?
danke und gruß
jan

wie soll dir jemand helfen, wenn du aufbau und code geheim hälst?


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