i hate to say it, but worst case scenario it could be your timing chain flopping around in its case. Had a nissan altima with the vq engine in it and while in my case it didnt happen till around 150k miles the technician at the time had said he had gotten a few in that had way less miles on them that were doing the same thing. One thing to also check for though is your oil level as the timing chain uses the engine oil to put pressure on the guide rails for the chain if i remember correctly and if it is kept at a low level for an extended period of time it can wear the guides out prematurely, im not saying that it is but if it only does it when the car is warming up it may be good to just check it.
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