I have been having the same problems with two of these cameras I just bought. No matter what the sensitivity they continue to e-mail snapshots 100's of times a day. I though it was a problem with the PIR, I unchecked it, kept motion detection checked, and highlighted 1 square in an area which would have no movement. I have it about 5 inches from the wall, I am sure there is nothing moving between the camera and the wall. Still getting 100's of email snapshots of a wall based on motion detection.
Trying to get the thing to save settings has become irritating. I get a time-out on its webserver 80-90% of the time attempting to save a setting.
I have reset, reflashed etc 2 times on both with zero improvement.