Hello again. I imagine that someone has thoroughly inspected the pully's for cracks,broken edges and/or mis-alignment. The other thing that could be causing this is an Air Conditioner compressor that is locking up form a worn clutch or bearing. Does it happen when the AC is on? A bad tensioner will also cause this to happen. Have you looked at the front of the engine while it's idling to make sure nothing is out of line or wobbling or noisy? There are no recalls or Technical service bulletins issued for this problem on your vehicle. I wonder if you are just getting a bad bunch of water pumps or if cheap aftermarket pumps are being installed.
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