How can I shunt noise to ground to prevent touch screen interference?

I have an AC drive on a circuit. The drive is outputing noise that is traveling through my two wire circuit that I am using to charge an iPhone. The touch screen loses some responsiveness to touch when the AC drive is on. When the AC drive is off, the iPhone works perfectly. Also, when the AC drive is on and I hold the iPhone in my hand... the iPhone works perfectly. So, when I shunt the noise to ground through my body by holding the bezel of the iPhone, it works perfectly. Is there a way to mimic this shunting effect to ground, so that if I have a case on my iPhone and the AC drive is on, the iPhone will still work? I have added ferrite beads, LC filters & capacitors but they have not solved this issue. But, I have not had a way to really calculate the correct components to add. So, I have been kind of shooting in the dark.

A wire from the iPhone bezel to ground is one solution.

sounds like the same issue as the one apple had a while back with the iphone 4 and what people were saying was improper grounding causing drops in cell phone reception levels.