Has anybody else notice the keyboard a bit sluggish when plugged into the factory charger. My daughter and I have been texting quite a bit the past couple nights. It seems like the when plugged into the charger the keyboard loses a bit of responsiveness. Sometime I have to double tap a letter to get it to take. I unplug it and everything is back to a smooth responsive keyboard again. I went back and forth last night wasn't my imagination there was quite a diffrence in response.