« on: April 07, 2014, 02:05:40 PM »
It could be the case that you have fake Lexar cards and that's why they are failing. Lexar, Sandisk, Transcend are all really well known firms and I have never heard that their production is failing (massively, as in your case).
Had a Sandisk disk-on-key fail out of the box. Couldn't copy anything larger than ~100KB to it.
Had an Intel processor fail straight from the shop, failing to install three different versions of MS-Windows from five different CDs.
This is a well known phenomena, which is why it is good practice to test memory cards before using them for anything of importance.