Seemingly caught a Monday model

I am a professional photographer for Hochzeitsreportagen go and was looking for a suitable card for use in a 5D Mark III. The map is really fast, here there are no problems. However, I had a data loss after the last shooting. This first made in Lightroom 4 by unrecognized Raw files and by erratic readings (parts of the image were with Orange / Blue lines crossed) noticeable. Were read the Raws with a Lexar USB3 CF / SD card reader (the outstanding reviews on Amazon receives). The error rate was ~ 5%, which is absolutely unacceptable. A further attempt to read the files on the camera via USB2 brought no improvement. Finally, I wanted to see a few candidates on the camera itself, here came the error message "Unable to play back image," the photographs are probably therefore gone forever (the RecoveRx software could also save anything).
The card will be reformatted before each shooting in the camera.
I give this product a two-star rating, not only because it has malfunctioned, but because the response from Transcend customer service was unsatisfactory. Instead of helping me to somehow salvage something, suggested the staff, I should format the card with the Auto Format tool thoroughly. He also blamed my card reader and suggested that I should get me a model of Transcend, because unfortunately there other card reader, which could damage the card due to lack of power supply.

Now I've found me a model of Lexar and hope that at least there the label "Professional" is justified.