Hello, I am trying to figure out a problem I have with nodemcu and

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Hello,
I am trying to figure out a problem I have with nodemcu and ws2812B strip.
I run the Cylon example, and sometimes the strip flashes briefly.
I use an external power 5V 40A, I add a 470uF condensator on the power line, the strip is powered from both ends, I tried with a level converter, it always does this. I don’t know what else to try … I have made a video of the problem : https://www.youtube.com/watch?v=Vg1eteHriKk
Thank you for your time.

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Tried the suggestions on this post?

https://plus.google.com/u/0/102523598814557363314/posts/BCfoJoqee5C

Try adding #define FASTLED_ALLOW_INTERRUPTS 0 before #include <FastLED.h>

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@Jason_Coon It’s ok now, I added
#define FASTLED_ALLOW_INTERRUPTS 0
Thank you very much.
In case of, my board is a LoLin, I tried with 4 of them from 2 batches and they had all the same behavior.
Cheers

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@Jason_Coon Just one question, is this line disabling all interrupts ? I plan to use a rotary encoder for my project, found this library ( https://blog.squix.org/2016/05/esp8266-peripherals-ky-040-rotary-encoder.html ), which is using interrupts.