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I think it is likely that some sort of pipe or wiring system is present under your floor. If a septic pipe has a slight leak in the center of your room, that would definitely explain the smell. If the leak was clogged and the crap dried, it would cause a stoppage of the smell, and then if part of the crap broke off and it leaked a little more, that would also provide a less smelly recurrence of the odor.
I'm no plumber or anything, but that's my take on it.
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