So lately I've noticed my noise and hum increases substantially depending on where I stand in the room. The worst places for me to stand are: Next to light-switches Right next to walls that have light-switches installed into them My amp (I get a major jump in idle hum the closer I stand to my amplifier head). My question is, is this due to an issue with my house wiring? Because at music stores I can't get a peep out of my bass. Regardless of volume level. If it is my wiring, is there any way to combat it? Thanks.