I doubt it has anything with screen burn in. It almost looks like some kind of short. Seems more of a hardware issue than a software issue.
Happen again last night as I set it up in my car. I am try to figure out what triggers it. Twice it happened as I was setting it up on my car's magnetic mount. But it does not happen every time I mount the phone.
Tapping the screen sometimes will fix it. Turning the screen on and off with the power button does not fix it for me. I had first time success opening and closing the phone with the fingerprint reader last night, I'll try this again next time.
Hopefully this is not another screen issue about to explode on the review blogs.