My phone was sitting there and I noticed the screen suddenly displayed what would be shown through an iceview case, but I don't have that case in, I don't even have it! It was dank, but wtf??
Add I'm sure you know, smartphones are susceptible to glitches. I'd go to Settings > Personalize > Ice View, and turn Ice View off. Hopefully that stops it from happening.
Any magnet near the phone or anything like that? Could throw off the phone thinking its a case magnet near it. As said, just turn off Ice View, doubt it comes back at that point