• No firmware issue. Changed the wiring and it works. DrAzzy might got the cause (but brightness was meaningless, therefore i hadn't guessed a hardware concern).
    I was using a bare WS2812 (6pin 5050) without cap. The curious issue occurs having
    WS2812.VCC and WS2812.VDD wired to the voltage Espruino.Bat .
    Now i had changed only WS2812.VCC to Espruino.3.3 and the issue has gone.
    Thank you and sorry guys.

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