First off, sorry for being so late on replies. I’ve been involved in a theatrical produciton, which has pretty much consumed my life for three straight weeks.
The clip, if played in isolation, doesn’t seem to exhibit the same phantom noise. It only shows up when the sequence itself is added to my master sequence (so it’s there if I disable every other sequence in the timeline).
Also, there’s another clip that does the same thing, in the same sequence; I’m wondering if it could be a problem with the master sequence?