I have 3 different car chargers, and it seems as though when I have any of them plugged in and I use my phone for something, they quit charging. It still shows that they are charging, but the battery % (patched) begins to drop instead of raise. If I unplug it and replug it, it begins to work again until I use the phone. Not a huge deal, but it is kind of annoying. Does anyone have any idea what this is all about, and how can it be fixed.