Solutions
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MitchTalmadge's post in Docker Corrupt? was marked as the answerI reseated all my various peripherals (SATA ports, internal USB header, M.2 slots, etc.) and recreated my Docker image. I've had no problems since then! I guess it was a loose connection. (I am still using the same USB drive as before, I guess there wasn't really any problems with it.) Thanks for the help.