My refurb D7100 has mostly been serving me well, other than the rare freeze-up on photo playback which I have remedied by turning the camera off and back on. However, this past weekend, I ran into a worrisome issue where I took a few photos and felt the mirror slap and the flash fire, but when I clicked on the preview button, the photos were not recorded. The problem seemed to go away after restarting the camera, but I'm wondering if others have encountered this issue and have any idea what might cause it. Thanks in advance!