Baking AO error

I’m baking Ambient Occlusion for a game asset. I have 4 objects to bake. The 1st worked (the cable part). But on the 2nd (the camera part) I get a wrong result on one face, it’s sort of cut in half, one half shaded the other not and some other faces of the camera don’t get shading at all. What am I doing wrong here? I tried changing the Split method for AO baking, but it won’t fix it. See attached JPG and BLEND file.

cone-14.blend (653 KB)