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All 3 of my Sony XQD cards have broken plastic on the dumb end, still work good tho.I have a 64gig Sony XQD that had a piece of plastic break away. It was at the camera business end, but I noticed it when I removed the card and simply turned the camera to have the piece fall out. I still use that card. Had no other concerns.
I think it is good practice not to fill any storage device right up from HDDs to memory cards. Fixation - a UK authorised repairer for Nikon and Canon and maybe others - as well as being camera dealers published this article on caring for memory cards:I'm no expert but wouldn't it come down to how the card is used, for example if some one was to clean / delete all photos after ever shoot I am guessing the card will not last as long as one that never gets deleted until the whole card is full first.