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Is there an easy fix for the line voltage interference?
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Maybe, maybe not. It could be a simple as making sure everything is plugged into the same power strip, using a good back-up ups for all plugged-n gear, avoiding multiple ground paths, reversing non-polarized power cords/plugs, and carefully routing cables to avoid power cords (including any cords from wall warts) being close and/or parallel to signal cords. Some have found that moving gear a bit to provide some separation helps.
Most current gear uses switching power supplies and they are prone to creating electromagnetic noise that can appear on power lines and radiate to nearby wiring. I had a camcorder that had an A/C adapter taht would induce noise into the video/audio if I was not careful how the cord was routed.