I have a semi-hollowbody Epiphone Casino, single coil pickups. Granted some hum is to be expected with this setup, however the hum I have is unusually loud. When I am not touching anything there is slight hum/buzz. When I touch the strings there is a very loud buzz. When I touch both the strings AND one of the pickups, the buzz goes away almost entirely. This buzz ONLY occurs on the neck pickup.
What is causing the buzz? Does the bridge lack proper grounding? or the neck pickup?