Is the cameras still under warranty? You should get a replacement if it is. Sometimes camera seals aren't good or they can fail over time. You can probably fix it by unscrewing the four fasteners on the face cover and taking it off. The face itself may screw off. Clean the lens and inside of the glass face cover. Some people have used hair dryers to dry out the inside moisture. Some people try to put little silicon bags tucked inside to absorb moisture, before they close the camera back up. Some put a bead of silicone when reinstalling the face cover. Make sure the focus and zoom holes have the cover put back in. The camera needs an air tight seal. The problem can be that sometimes, when this happens no matter what you do it can reoccur. Hopefully you can get it replaced altogether.