Dual 450mhz Gigabit Ethernet - Processor drops out.

Hi,
I have a G4 Gigabit Ethernet with dual 450mhz processors, and I am having a problem where one of my processors will drop out all together. This has happened sporadically over the past year and a half that I've owned the machine, but it has happened three times in the past month. This doesn't seem like a good sign to me. When the processor fails - according to the activity monitor it's always the same processor - the only way one can tell is by the slowdown of the machine; there are no app crashes, freezes or anything out of the ordinary. A simple shutdown and boot up is all that is needed to get the processor back online, and once that has happened the processor keeps going. I can continuously run this Mac for days without incident. Before this, months.
Has anybody else run into this problem?
Thanks in advance.
Malcolm

Thank you Japamac and Rodney,
When my friend, who is a Apple certified tech, comes around later this week to scope things out with my Mac, I'll have him check the heat sink and thermal compound.
When the processor dropped out the first two times, it did seem to coincide with an application crashing, the same app both times. However with the latest three episodes, there was no crash and that application was not running - The app I suspected I use almost on a daily basis and it has crashed a couple of times without coinciding with the processor dropping out - so I'm moving away from that theory. As I said previously, when the processor fails, the only way you know for sure is by the degradation of performance. I have also had one freeze up quite recently (maybe the third in a year in a half) but I don't know how you could determine if it was related to this problem, though. There was no information in hardware diagnostics.
Again thank you for your replies.

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