Hi guys, I am using the Matek F4 AIO FC, but I got some yaw twitch problem.
I heard from some of you solved it simply by dropping pid loop frequency?
Or is there another solution?

Make sure you use low ESR capacitor on either your ESC's, or XT60 power (required on AIO boards)
Soft Mount your FC
Use lower looptime, such as 8K/8K or even lower, I've found people are mostly having problems on 16K/16K

If you are still having issues, drop your Yaw P gain, and increase your TPU to like 0.4

Which FC? The early 405 and 405 AIO had a twitch issue due to using a sensitive gyro. As JP said turning the gyro loop down to 8/8 fixes it.

I think they are talking about the early version. The later version is renamed to CTR.

Cap on lipo fixed the twitch on my 405 AIO.

you could try turning down p on your yaw. I'm not sure if you can turn up d on yaw, but if you can turn that up a bit and leave p alown. unless d is causing your motors to get hot, then turn down p .
f.k.