One problem related to transmission slip out of gear has been reported for the 2010 Mazda MAZDA3. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2010 Mazda MAZDA3 based on all problems reported for the 2010 MAZDA3.
Have had a situation occur about a dozen times since I purchased new in July 2010 with 93 miles - now at ~35500 miles. When coming to a stop on a cold engine that has only been running about 2-3 minutes, clutch pushed in to shift out of gear and brakes applied engine will rev to ~2500 rpm and it will stay there for about 3-4 seconds. First few times it happened I figured I hit the gas as well as the brake, after that I began to check my foot position on occurrence and my foot was nowhere near the accelerator. This has not caused any problems with a car accelerating on its own as it typically occurs as I am pushing the clutch in to come to a stop. Only happens when the engine is still cold (generally the first stop of the day) and is very random when it occurs. Have not brought to attention of dealership as there are no common factors to be able to reproduce the problem. Upon notice of other complaints for this issue I wanted to add my own experience.