When I was turning off ligths last night on my way to bed, I noticed a switch that was quite warm. I flicked it off and on noticed that it was arcing (blue, sometimes organge flash/spark behind the wall plate). I took off the cover, took out the switch and noticed that the black insultation around one of the wires connected to the switch had melted a little.
not sure whether this is related but . . . That switch is for some overhead lights in the kitchen - one fixture that hangs over the island and another set of pot lights. The lights in the fixture are halogen (4). Both the bulbs in the fixture and the pot lights seem to blow often. We've in the house since June 2013 and I've probably replaced 6-8 pot lights and 4 or 5 of the halogen bulbs for the fixture.