I have a launch day Black Nokia Lumia 920, and it has been working great. I have had none of the common issues that have been reported, but today after waking the phone after mild use throughout the day, I went to send a text and the screens sharpness dropped as well the colors seemed washed out, it went away after lock, and unlocking the device and I have been unable to replicate the issue. Has anyone else had this issue? Is it a software issues like the purple keyboard on the Lumia 900? Should I exchange my device? Any help would be appreciated.