Choppy playback of AVCHD footage. 1920 x 1080 60p. Imported as optimized media.

So I have some stuff shot on different days, same card, same camera, same settings.  1920 x 1080 AVCHD 60fps progressive, imported as optimized media.  I know my computer and external drive are able to handle this kind of footage. What is puzzling is that some clips with the same specs, play back very choppy (like unrendered media) and others play back wonderful.  What gives, I must be missing something obvious. Why would some clips play ok and others really badly?  I have double checked that everything (codec, frame rate, optimized vs. proxy) is the same by viewing stats in the events browser. Dropping these clips into the timeline does not show they need rendering, but if I output the clip as a master file, it plays fine. I have clips in other events that play great, with the same specs.  I am at a real loss. thanks gentlemen.

Sorry, but I can't think of anything during import that would introduce errors that would cause  choppy playback. A momemttary loss of connection would be a problem but would typically corrupt the file and it most likely not play at all.
If you hadn't said that some clips played (or previewed) perfectly smoothly, I'd suspect a hardware problem.
Maybe someone else will have some better ideas.
Russ

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