Driver side speaker working intermittently

What is your question?

When I start my car and play music all the speakers work normally. Then after a little the driver side speaker will stop working and maybe crackle every once in a while. This doesn’t happen when I hit a bump or when the car shakes. It happens even when everything is still in a parking lot . I was wondering if the amps for the driver and passenger side are one different amps or the same

What makes this problem better or worse?

Playing music

How long has your 2010 Ford Mustang had this problem?

Since I’ve had the car