I have the same problem. Photos and video disappearing from Camera album. My Note 3 started losing photos around February 11, 2015. I have a SanDisk Ultra 64 gb card. When I take a photo, it appears in my default Camera album for a short period of time and then after a while or when I reboot my phone, I just see a greyed out Icon with a silhouette. If I move the photo to my phone memory, it stays there. This happens for videos as well as photos. I have Verizon and the store employees could not help. It was a new issue they had not seen yet. I have installed a different card and it seems to be holding photos. But the card with issues is not defective. The card with issues had 880 files and will not store anymore.The card I replaced it with is also a SanDisk but it is only a temp card, so I'm still looking for an answer. Verizon sent me a new phone under my warranty, but I prefer not to go through a transfer only to have the same issue come up again. From what I am reading on this board, this may not be defective hardware. I read that someone has experienced this problem since Feb 11th (just like me) and I find that to be odd since mine started about the same time frame. I live in Orange County Ca and my service provider is Verizon. Any clues to solve this would be appreciated.