I had same problem last year, I moved camera and went back a week later, opened it and ants everywhere, i blew them out of there and put in the freezer, blew out again, and camera was working, was, somehow something rolled in there or fell into a circuit and it started to smoke, I took batteries out and it was a ant carcass ,, camera was torn apart and cleaned , worked fine after theat, clean everything ,and everywhere, seal with a lil dap of caulking anywhere you think they can get in,, i am afraid to spray with insectide ,due to smell or worse corrode the camera's parts.