My Dell 15R N5010 periodically freezes for a few minutes, turning to a white overlay, and then continues working fine. It has dones this from day one, but happens some days 1 or maybe 2 times, and other days not at all. I have just been living with it as I needed it for my work, etc., but now curious about an answer. I tested original 4GB memory, replaced all memory with new 8GB and still freezes. I've msconfig all non essential programs from starting and still randomly freezes-unfreezes. I am at a loss.