Cubase freezing and cutting out during playback

During playback I get an issue where it will freeze and jump during playback. I have two instances of Kontakt open and some effects running on each track. When it freezes and jumps, the audio will also cut out until it jumps back to moving.

Buffer size is set to 256.

I’m on a Macbook Pro 2015 16GB ram with a UA Apollo Twin thunderbolt.

On the same computer, I can run many more instances of Kontakt and more effects in Ableton without it having any playback issues. Buffer when using Ableton is also set to 256.

Any idea what the issue is?

I’d post an example but this dumb fvcking forum won’t let me post “links”.