Nokia Lumia :: 920 Screen Sensitivity Degraded While Plugged In?

when I use the phone while plugged in, scrolling around on the screen sucks. As I swipe on screen, it sometimes won't swipe but will just launch apps that your finger touched last during the swipe. If I swipe slow, it seems to help but sometimes refuses to move and will just launch what ever y finger was touching last when I lift off the screen. It's really annoying and makes the phone useless plugged in because you can't navigate the phone consistently. When I unplug it, it works flawlessly. It's instantly better.