Manual Transmission Problems of Mazda Protege 5

My daughter drove my Mazda Protege 5 to pick up my son and to retrieve something from a friend's house. She parked the car on the friend's flat driveway, placing it in first gear. While she was inside of the house, the car somehow popped out of gear and picked up enough momentum to roll onto the road. The road was a hill, which caused the car to accelerate. The car ended up striking a house, causing damage to both the house and the shrubbery outside of the house. Nobody could find any apparent problems with the car/transmission.

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I purchased a used 2002 Mazda Protege 5 about 3 months ago. The 5th gear started popping out of gear about a month later, then acts like it is in neutral when you put it in 5th gear. I was told I need a new transmission for about $2500. This should not be happening on this new of a car. I have read many other reviews and complaints, it seems like it is a pretty common occurrence, why isn't a recall being made?.

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