Whatsapp (Android) makes some pictures blank and appear black while sending on LG G3

Steps: 1. Capture some pictures, say 10 pictures -- I am able to see all images in the Gallery 2. Attach all of them in whatsapp -- I am able to see all images in the preview 3. Send -- Some pictures turn black (actually they are empty; I checked the size) 4. To the receiver also, same observation, that is some are black and some are alright. What is the problem and how to fix it ?