Max number of leds on arduino due, txs0108e ws2812b

Hi to all, using example "blink" on fastled library, i' m able , changing the led position, to switch a single led on a 3 mt stripe 332 led/meter. Why it works only up to 699 led and no over?
Between arduino due and led stripe, there is a level shifter from 3,3 v up to 5v for data.
Any idea?

Due doesnot have such limitation that prevent it to use more than 700 leds.

I have used 8000 leds with Due.

Please show your code.

Fixed.... our chinese mates made a bad weld on data line.

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