Is my card to slow for the camera? video jumps out of quality???

[Mads Landdorf Rasmussen]

Why does the video in the recordings sometimes “jumps out of quality” ?
Video shown here
https://youtu.be/ovdBpDLnamI

It does it sometimes and I can’t figure out why.
is it because i’m shooting 400 mbs while recording and the sd card is only 170 mbs and then it’s loading too fast and is has to “jump out of quality” for sec to follow the reading speed of the card or what?

While recording I was shooting

Fuji xt 4
4K

400 mbs
25 fps

SD Card
170mbs
128 gb
Class 10
U3
V30
sandisk extreme pro

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