Audio waveform doesn't redraw

my source has consistent audio, (person speaking)
the waveform goes flat, and yet there is audio (you can see it on the VU meeter)

“Reload” does fix it.

reporting because this is the first time I have seen it like this in the middle of a clip.

Try to split and press f5

Is the clip ahve variable frame rate ? (serch with media info?)