Regardless of ambient light and speed of dialing or whatever, the screen will randomly go dark requiring a tap of power button
Brings me back right where I was
Sometimes as I go to end a call, before I can get to the END button, it blanks out
Other times midway between dialing a number it blanks
I have Auto Dimming enabled
Did not do this for first week and half
Now in my third week of owning this phone
Great phone so far except for above, no battery complaints...