Transmission Slip Out Of Gear problems of the 2007 Mazda MAZDA6

I started hearing noise that sounded like I had ran over a bump in the road, then I noticed when my car switched gears it started to sound like a loud thump. This was unbelievable to me as my car only had 28k miles on it. I took the car to the dealer and they couldn't find anything wrong with it. However, when I took them driving and accelerated and the car changed gears, sure enough. . Thud! the service manager said turn around carefully and get back to the dealer because this car is dangerous to drive because it's slipping out of gear. They had my car for 6 weeks trying to get a good transmission from Mazda to put in my car. Now it's 3 years later and my car has 82k miles on it. I had a broken motor mount two weeks ago and there has been a noise in the front wheels that I have been told is the strutt mounts but they can't seem to hear it. My daughter and I took a day trip this week and the day we got home I was running some errands. One place in particular is very hard to get out of and into the flow of traffic and you have to accelerate very quickly. When I did, my heart dropped because what did I hear but the familiar thud! yes, my transmission was slipping again and my car is sitting in the shop as I write this waiting on another transmission. I don't think my transmission will ever go out of warranty because they have to keep replacing it. I just pray it doesn't take 6 weeks for them to receive one that they consider good enough quality to install into my car again.

The other day I was driving and I was trying to speed up to get on the interstate ramp. My car acted like it didn't want to shift out of 3rd gear and wouldn't accelerate much. It then shifted into 4th gear and there was a very loud thud and the car jerked. The thud and jerk have begun to happen almost every time the car shifts from 3rd to 4th gear.