Nylon wheels on the 1x30? That would do it. Anyway, a common problem with all sorts of grinders. Various solutions have been tried. You could get an anti-static mat to stand on. Try one of those grounding straps that attach to your wrist. Put a wet sponge on your grinder so that it keeps the wheel damp (messy!). Put a ground wire on the grinder itself. Humidify the air in the grinding area.
One of those should help, good luck ....
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