Well if it's the second one in a row with this issues, I think there must be something you're doing wrong? Or maybe your SD card specs just aren't supported? What are the full specs of your SD card? And is it one of those extreme high-speed cards for (video) cameras? And aside from reformatting it on a pc, did you ever try reformatting it on the tablet itself? This is an issue I've not read of about this tablet before so it kind of puzzles me that you already had it replaced once and immediately have the same issue again.