Look in Premiere Preferences for the checkbox that says "Write XMP" and disable that. I don't know if that feature is "corrupting" the clips, but it does alter some data on them and many users want to avoid having their data touched, for good reason.
Safe Harbor Computers
Thank you. I strongly agree and I do not want data touched at all.
Do you know what purpose that XMP serves? Is it primarily used during link and locate?
The option "Write XMP" writes metadata to each clip, to give it a unique identifier -- so says Adobe, anyway. Can't speak to the consequences of deselecting it, but since selecting that option is a default, it would seem unlikely that the added metadata is corrupting your files in this peculiar way, otherwise, there would be countless similar complaints.
I have seen many complaints. Not about the image being corrupted, but that the writing of the XMP data changes the date on the video clips and that creates a big problem for some user's workflows. And therefore it can be turned off to avoid that.
How are the clips being Imported? Should definitely be using MEDIA BROWSER in Premiere, and NOT the standard "File > Import" for this type of media.
I have simply dragged files from my finder window (Mac). I have never encountered any issues with doing so. That may not be best practices but I would not imagine that would cause any corruption.
Also worth noting, the clips had been arranged in the sequence and the edit was nearly complete before any of the glitches ever appeared. When this occured for the first time, I thought I may have just overlooked the glitch frames at first but then it appeared in a sequence that I was very familiar with.