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I saw similar lines - only vertical - before I had insulated my cold finger. Once I taped that up, it seemed to go away. Appreciate this probably isn't helpful to you as you've insulated yours well previously.
Doubt that it's the USB hub or cables...if they were susceptible to any interference they wouldn't be able to transmit data very well.
Have you tried regulating your fan speed and seeing if it changes with varying voltage?
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