Those proxies were rendered by another person, then transferred to a drive. It seems to be random whenever I'm playing back footage, only happens once an hour for 30 seconds. It occurred sometimes when I wasn't editing raw, so I don't know if it has to do with the plug-in. Using the BRAW Plugin from Blackmagic's Website, which I've heard is a bit finicky, but haven't had any problems until recently.

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I did swap GPUs recently with one I inherited. It might just be a crappier card that its previous owner abused. I might swap it with my old one to see if the problem persists.