I had the same problem a sudden drop in pressure in my bathtub but no where else? I removed the plastic cover on the faucet which allows you to lift a retaining pin and remove the guts.I found where the ball valve opens and closes it was slicing small amounts of plastic which accumulated and cut off flow.My faucet was a Moen.

Hi RandMil and welcome to the Plumbing pageat at AskMeHelpDesk.com. You piggybacked on an a 2 year old dead thread so I gave you one of your own. In the future, before you post, look in the upper left hand corner for the date.

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I found where the ball valve opens and closes it was slicing small amounts of plastic which accumulated

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That's before it gets to your Moen valve. Where is this ball valve? What does the plastic look like? A baggie? Something harder? More details please, Regard, Tom