[fly_with_v]

This is most likely noise in your electical connections. Try an isolation grounding surge protector. I use an APC AV G5 power distribution unit. I had the exact same problem and this solved it. Try to plug the unit into different outlets in your house to see if the noise goes aways. Make sure all dimmer style lights are off, not dimmed all ther way, they cause a lot of electrical noise. Try unplugging and/or turning off everything in your house. If these things clear the problems up, you need to get a power distribution unit with filters and isolation. The best you can afford, not the cheapest. I have also had good luck with Tripplite Isotel Surge protector which are only about $60. If this is the problem I don't thingk ground lifting will help.