 2 weeks ago, I directly emailed to Mazda company with the problem. Then, the issue was transferred to the representative of the dearlership in which I bought, so they was informed by me that issue, and they drove the car with me, but they just explained that " problem is because of new SkyActive transmission, so we cannot sovle the problem fundamentally because the wierd sound is part of manufacture." So with disappointment, I returned to my home.... ....I live Philadelphia suburban area, which means I live in a little bit cold area, but the wierd sound is not related to the cold weather......... 