I have a Zagg on my ip4, no other case or anything. It very subtly slides around on both the front and back, over the course of a few months...sometimes I'll notice it has moved to the very edge of the device, or even start to overhang off the edge. I have to force it around with my thumbs to get it back into the proper position. The worst is when it slides to the edge and you don't notice, and then you put it in your pocket and that little bit touching the edge grabs the fabric of your pocket, pulling the screen protector right off (and obviously ruining it). I've gone through several screen protectors now, and it sucks having to buy new ones (or shipping them back to Zagg). I'm wondering if the Ghost Armor or Power Support ones are sticker and will slide around less. Has anyone else had the same problem?