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Can you tell if there's bridging between the joists? No matter - put in more; like every 12". If they're normally spaced, you can buy metal bridging that'll work; if not, cut blocks of wood and wedge them in.
Yes...as the wood expands and contracts over time, the holes where it was nailed tend to loosen a little around the nails and the wood slides along the nail shaft creating the squeaks. Usually a few well places screws will help alleviate the problem, but you need access to put the screws in.
