Why would a 5 year old vehicle with 58,000 miles need transmission work? $$$$

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I am very frustrated because I took my car to the dealership due to a jerking when the car shifted gears while driving at slower speeds. The car has 58,000 miles on it and has been out of warranty for about 1 1/2 years. I was told that the car will need a valve in the transmission which will cost me $2,900.00. This information is from the dealership. I have never had transmission problems with much less expensive cars at any time in my life..In researching this topic online I've learned that other consumers are experiencing the same problems with their Volvos and transmissions...it seems that mine has much lower mileage. The dealer says that their hands are tied and that they have tried in vain to get some type of assistance from Volvo...DO I HAVE ANY TYPE OF RECOURSE???? I feel that I am being taken over the coals after spending $48,000 for this vehicle five years ago.