I got a phone call from a technical service guy at Porter Cable in response to my email complaining that the collet gets too hot to hold, even when the router is running unloaded. He said that they now use "full contact" sealed bearings because they give longer life than the older bearings, which had a tendancy to fail from contamination. He said the new bearings tend to run hotter, and that PC regularly gets complaints about the heat. He offered to send me another router, but warned that it may be no better. I took him up on his offer, since it's unlikely to be worse than the one I have.
DonkeyHody "We should be careful to get out of an experience only the wisdom that is in it - and stop there; lest we be like the cat that sits down on a hot stove-lid. She will never sit down on a hot stove-lid again---and that is well; but also she will never sit down on a cold one anymore." - Mark Twain