[Beefstew83]

I bought an aftermarket(ebay) charger and have experienced the same thing with it. It doesn't matter if the phone is in my hand or not, the screen is unresponsive if the charger is plugged in. When I unplug it, it works fine in my hand or on any surface that I have tried.

Of course, this charger is sketchy from the get-go since I have to jiggle the plug to get the phone to charge and when I set the phone down the charge light sometimes goes off. Also it seems that charge light on the phone goes off when it reaches a full charge on this charger.