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Could be an open neutral somewhere? Open neutral = not a continuous uninterrupted white wire returning to the load center (breaker panel). This can be, but not always, a very dangerous situation. Possible someone is switching the neutral instead of the hot wire. Never, never ever, fuse or interrupt with a switch the neutral side of a circuit. Also possible loose wire nut on the neutral in a junction box somewhere.
I worked in a house that had switched neutrals as originally built (I guess they did that many years ago) then had been partially rewired the correct way with switched hot wires. It was a time consuming mess.
Good luck, and if in doubt, call an electrical contractor.
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