Screen doesn't work when taking pictures

When I'm viewing things in picture or video mode the screen goes crazy with lines that extend across the screen and run up and down. when I switch it to view pictures that have been taken the screen works just fine. I left my camera in the trunk of my car and it was pretty cold. I brought it and it started having this problem. I figured maybe it needed to warm up. so i put it on the charger and when I checked it it let me take some pictures just fine so I thought I was in the clear but the same problem has started back up after taking a couple pictures.