I just upgraded to the LG G4 last week. I transferred my SD card from my Samsung S4 with all my old pictures and videos. I have been saving all my new pictures and videos to my SD card as well (The card is less than half full). Tonight I was taking pictures and videos with no problem. I was watching them and even texted a few to my wife. I went to take another picture and it could not show me the image. I tried this several times with the same result. I rebooted the phone and when I did all pictures and videos I have taken on the phone are now gone. I cannot find them on the internal memory or the SD card. I have taken the SD card out of the phone and looked for the pictures on my computer. No luck. All of the pictures from my S4 are there but nothing since upgrading to the G4. Has anyone experienced this? Does anyone have an idea of how to retrieve the pictures and video?