I bought this camera, new, several weeks ago, then went to my Dad's 75th bday party and took lots of pictures. I took some on the 29th, 30th, and July 1st. Upon viewing the ones from the party on the 30th, I noticed the date was set incorrect, so I changed it. I went on taking pictures the next day. Later, when trying to share them with family, I discovered that the pictures from the 29th (some) and July 1st (bday party) were GONE!!! I did not delete them. I did change the battery on the 1st, but nothing unusual. Any ideas?