Be aware that in auto modes, when using the built in flash (don't know about sb700 - didn't have one at the time this occurred), the camera tends to blow the ISO setting through the roof. I found this out in a discussion here comparing quality of pix from my point and shoot with those fom my 5100. Someone asked me to post the settings for both cameras and that's when I found the 5100 was shooting at ISO 3200 even though it was set for ISO 100.
There is a setting somewhere in the menu that will limit how far up the camera can push the ISO on its own. It might be helpful to limit this "feature".