Check the lamp & trim combo. Many cans have a wattage limit for one type of trim, and a difference wattage limit for another type of trim.
Nothing I've heard or seen, out of at least a couple of hundred over the last few years. Though I have to admit, I find the 4" cans to be a PITA, and try to steer people toward the larger sizes when I can.Has there been a recall on 4" cans anyone knows about or is anyone else having more than normal calls about blinking cans installed from a while back??