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Another way to resolve the grounding issue is by using a usb isolator. There are expensive optical isolators on the internet. A cheap alternative is the USB2ISO isolator offered by the following website: http://electronics-shop.dk/galvanically-usb_isolation

It isolates the ground of the peripheral usb device. This has solved my grounding problem at a small additional cost. Hope this helps those who are reluctant to spray their alphatrack.