I have Halo 5" H5ICAT recessed cans in my house. New construction about 5 years ago. One of the can's has always been a problem. It is mounted in the ceiling with the attic on the other side. The first problem is that only this one can would shut off and eventually cycle back on, presumably due to overheating. I'm using 65w lamps everythere. I don't know what trim I have, but all the lights are the same. Even though these are IC rated cans, I went into the attic to cut away some of the insulation. My house is spray foamed, but the ceiling only has foam around the perimeter and above the cans. The foam people wrapped each can in fiberglass insulation and then sprayed a skim coat of foam all over it to provide an air dam into the room. The entire thing was then covered with sprayed in paper insulation. So let's say it was really well insulated!

I cut off the top of the foam insulation and removed some of the fiberglass, covering it back up just enough so that heat could escape. That seemed to fix the problem, no more cycling off. But here's the new problem -- the lamps are burning out prematurely. The last 65w lamp or bulb I put in blew out as soon as I turned on the switch. I checked the voltage at the can, which was 106.5v, the same as another one in good working order.

What could be causing the lamp to blow like that? Thanks for any clues.