general problems of the 2014 Mazda MAZDA3

My gear box was popping out of gear at highway speeds into neutral. The service provider informed me the transmission in the car was bad, adding that it the bad transmission caused excessive wear on the clutch-and-flywheel assembly. It later came to my attention that there is an ongoing class action lawsuit in the state of California, represented by cafferty clobis meriwether & spengel regarding defectively-engineered transmissions of 5- and 6-speed Mazda 3s manufactured between 2010-2015. I had the clutch, flywheel, and transmission all replaced. I cannot be certain that the new oem transmission part was re-engineered to correct for the original engineering defect and I am greatly concerned that the issues will repeat themselves soon, putting my family and me at risk. I am attaching a letter I sent to Mazda regarding this concern.

As I was turning into a parking spot to park my car, the car accelerated on its own and ran into a concrete wall. I have had issues with this car's programming, including when I took my car in to get fixed after the safety recall in January '16. As I realized the car was accelerating - and pushing on the brake would not stop it - I lifted the emergency brake. The crash ultimately stopped the car - not the brake or emergency brake, and the airbag deployed. Less concerned about the damage to the outside of the car, and more concerned that I had zero control over the car and any ability to stop it.

I initially had issue getting into and out of the 3rd and 4th gear (manual transmission car). I could feel gears grinding during shifting (with the clutch fully depressed). The dealer replaced the third gear. After the fix, the car now has difficulty getting into and out of gear 2 and 3. This problem is intermittent but is more noticeable after the initial start-up of the car, especially if the weather is cold (50f or colder). With the clutch fully pressed, I can still feel the gear rotating and grinding during shifting. When the car is cold, a lot of force is needed to shift the car into 2nd and 3rd gear. The shifting issue is less noticeable when once the car has been operating for 20mins.

Harsh vibration in cabin similar to an engine misfire occurs randomly near idle or immediately after ignition. The dealership and manufacturer have been made aware of this concern and were unsuccessful in reproducing or isolating source of the vibration. Video documentation of the failure during its occurrence has been provided to both parties and has been forwarded to the senior regional engineer for analysis. Current owner has an open vehicle repurchase claim under lemon law with the manufacturer pending investigation of fault.