When I am asked to sign in on cloud or e:Mail a black box about 1 1/2 inches high covers the area and blinks and I cannot see slots to enter info nor can I see the "submit" key unless I am lucky enough to hit it during a 1 second blink. It started this after a few months. A previous tablet did the same thing and Verizon store exchanged it for my current one. I have done all of the restart, deleting account and trying to start it back up.