Why is Khmer word spacing so inconsistent in subtitles?

I’m an immersion-focused learner trying to watch Cambodian TV shows, but I’m struggling because the word spacing in Khmer seems to disappear or change depending on the speaker's speed. I can recognize the characters, but without the spaces, I’m having a hard time identifying where one word ends and the next begins. How do you all handle word boundary segmentation when consuming native content, or are there any tricks to stop reading them as one long run-on sentence?