I just got the Charge and it's great, but if I turn the autobrightness on, the phone usually dims to a point where you can barely make out the image on the screen. At this point I've got it set on the maximum brightness with auto-brightness turned off; even so, sometimes when I hit the power button to turn on the screen it comes up dimmer than usual. I have to turn off the screen and turn it back on and hope it brightens up to a usable level. Is this something others have noticed? Or should I get a replacement?