Someone buried alive inside the wall cavity 
all I hear are ghosts.
Where were you.
What other rooms were close.
Upstairs bathroom, master bedroom/bathroom and on the other side of the walls, above laundry/utility room. It goes from sounding like dripping to bouncing and hammering, silent at times, no schedule…sounds like someone with a paddle board messing around!?💁🎾
It sounded like a clothes washer from here.
That’s why I asked where you were.
Good luck! 
Does the attic have wind turbine vents?
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That’s definitely a repetitive, mechanical noise.
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Dryer vent, exhaust vent flapper door banging around in the wind.
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