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Possible fix for a "bad" knock sensor and hard to crank engines when hot
I actually had the same problem with my Altima. My engine computer said that my knock sensor was bad, and every once in awhile it would die out then be hard to restart while the engine was still hot.
However, after I replaced my air filter, both problems went away and my car runs fine now (well, that and the tune-up I gave it... ). Both problems fixed for about $10 (Fram air filter from Kragen Auto Parts) and 10 minutes, as opposed to the $$$ I was going to spend on a new knock sensor!
Try it out and see if that works, and if it doesn't you're only out a few bucks and the car probably needs a new air filter anyway.