RL_FlashFs affect my interrupt handler

my question is Dos RL_FlashFs turn off interrupt?

I am using a EXIT interrupt to sampling A/D,the EXIT interrupt freqency is about 50k.

I find every time when I handle files,the sampled data is discontinuity.

So I think if the RL_FlashFs somewhat affected the interrupt.

if so ,how to avoid this?

I'm use STM32F407 MCU.

The EXIT interrupt is set to high priority level.

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