I use Nikon D7000 camera and I never have problem with my 8 GB SDHC cards. I had the same problems with SanDisk 16 GB SDHC cards in the past and recently with 128 GB SDXC cards; I had found some of my photographs were not recorded/ saved in those memory cards so I lost my important clicks. I need to go to some really remote places of Himalayas for taking pictures for many days, so I always need memory cards with higher capacities. Is this the problem with my camera hardware/ software or with memory cards or my camera not supporting higher capacity memory cards? Up to which highest capacity of SDXC memory cards can I use in my camera? I have never updated firmware/ software after buying my camera in 2010. Do I need to update them to resolve this problem? Can I do the updates by myself? Sorry for too many questions and thank you so very much in advance for your kind and valuable feedback.