Hate to tell you this but it's probably the camera. Mine did the same thing when I first got it and I sent it back. So far the replacement camera has never done that. There are two things you might try. First, turn the sensitivity control to normal or low, it doesn't have to be on high in the colder temps. Second, you might go to their website where there is a download to fix some of the problems with their earlier cams. Hope this helps.

Blessings.....Pastorjim