Hi Suzan. Thanks for following up. Yes, I did solve this. Given that this only occurred with my laptop and not my desktop, I suspected it was the computer and not the camera at fault. I finally found a USB power setting in the Lenovo software that allowed the USB outlet to be used for charging, even when the computer was not in use. Disabling this solved the issue. Must have somehow affected the USB power output I guess, but I am happy to be able to shoot again tethered to my laptop.
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