Mazda 3 (2013) USB Port NOT working properly?
 

For some reason, the USB port stopped working since Monday. It does play music (VERY LOW) with super loud buzzing noise. I know it's not the audio system itself since FM/AM/ Bluetooth work just fine. The USB port still charges my phone but just doesn't play music properly. I tried 3 other Apple USB cables but no difference. Anyone ever had this issue? It pisses me off because my warranty just expired two months ago 😩

It look that your USB connection is making contact with the chasis. It might be the section near to your handbrake.