Only two tracks of audio, no effects. All audio matches project sample rate and is uncompressed. All video is rendered. Media is reading off an SSD.

I've basically given premiere the easiest task it could ever have, but it can't play more than a minute without one or all tracks cutting out briefly or completely.

Fully up to date Premiere. Mid 2015 MacBook Pro, so not brand new but should still be capable of basic edits. I tried changing my buffer size but it hasn't made any difference. Same with video playback quality.

How has playback gotten this bad and why isn't it being fixed?