Hi guys, I have had 36 clients approach me with the same problem. I saw no drop damage. Some are even so careful that I believe their iPad mini 2 and 3 never even witnessed a drop let alone a scratch. Bottom line is, I had to replace all their screen, the one underneath the touch glass. SO far none of the clients returned to me for complaints. I believe this is a hardware issue, a design flaw from Apple’s part. I also believe mini’s are plague’d with this white line problem.