I bought 6 Halo H7ICT recessed cans
for my breezeway remodel. After about an hour or so of having them on the last two nights, one of them shuts off (not the same one). I have 75 watt incandescent bulbs in them, on a dimmer. The insulation is installed (R49) and the ceiling is now drywalled. They appear to be rated for 75 watt bulbs, so I'm not overloading them. I temporarily put in 60 watt bulbs in the two that have been doing this, to see if that makes a difference. If it's a bad thermal unit, are those replaceable?
The other potential issue, is that the dimmer gets pretty warm. It's Lutron dimmer, rated for 600W. Also, when the bulbs are dimmed, there's a quiet, high-pitched noise emitted from the lights, which isn't too anoying, but noticable. Could it be a bad dimmer? Are there better brands I should be using?