D810 USB tether wear.

Hi all, I've been using a D810 pretty much permanently tethered in the studio for the last year or so and noticed the usb ports on both camera and the mac are getting very slack and loose causing connection failures. I've gone through a couple of replacement usb leads (Tethertools rt angle type) and wondered if any one has actually managed to ruin their usb ports this way and how much it would likely cost to repair?
Many thanks


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