vibration or shaking

Hello, I purchased a new 2019 Mazda 3 in March of 2020. And since then I have noticed the driver's seat vibrating or shaking at certain speeds. What this means is that my butt vibrates and sometimes my thighs will vibrate gently. Kind of like you are in a massaging chair. Anyone else notice...

I took my Mazda3 CPO back to the dealership a week after purchasing it since the shifter vibrates while accelerating in the 3rd gear. They replaced the shifter assembly, however that obviously did not solve the issue. I took the car back to them and fought to get them to acknowledge the issue...

What's up guys this is my first post on this forum! I'm hoping that being a part of this will help me take care of my car better. I like to listen to trap music, therefore am really into a lot of bass. I have a '15 5-door w/o Bose speakers and they're starting to make parts in my car vibrate...

So, I only had my new Mazda 3 S Touring for less than 3 months when a truck driver hit the back driver's side of my car :( .... So, I took it to one of my insurance-company-affiliated auto body shops for full repairs. The repair total came to almost $6000. The entire left quarter panel, rear...