I also have S905X and see the stutters very often. It would be great if stuttering appear only once at the beginning but it stutters also when italic subs are displayed. And then once again when regular and so over and over again.
Mostly they're micro stutters, barely visible and sometime they're more noticeable.
Kszaq said it will be fixed in Leia.
The bug is still present in adamg 8.90.1 which is Leia but it's in alpha stage.
If not... well, there's still flawless Jarvis build.