Hello, I have bought in eBay cheap cover folio stand case for my iPad mini retina and I found out that when I close the case there is a lock sound so I figured out that this is what called smart case. the problem is if the case move 1mm he make the sound lock again. I afraid that this cheap case can damage the magnet lock in my iPad. should I buy a branded case or mine is ok? sorry for my english i hope that you will understand my issue.