When I have my Nexus One charging, the touchscreen no longer functions properly. For example: when the slide lock is enabled and I try to unlock the phone while its charging, it acts as if I'm touching each circle individually. But thats not consistently the case, sometimes I can unlock the phone successfully. But generally if I do get it unlocked and start using some apps, I run into issues with the screen again and the phone becomes unusable: letters pressed when typing a message are duplicated; it jitters and gets stuck between screens when sliding across homescreens; the 4 main buttons on the bottom don't respond to being pressed; I've even managed to get to a point where I simply have a black screen and the status bar at the top. All these issues go away after I unplug the phone and wait a few seconds for the charging to "disengage".