This is interesting. I have noted I will go out to the car and both front speakers will work, and may do so for the day. Another day I will go out and then they won't work. Another day they might, or might not.

I will have to pull one of the door panels and take a look. Not sure why both front speakers stop at the same time and then work again.

 

Loose wire at head unit? Gremlins messing with fader?

 

Mine has that problem too- door speakers stop working when it rains or is damp. I'm searching this site for the answer, or at least for a tutorial showing the easiest way to replace the speakers. I have replacements for the front door speakers but have never had much luck pulling door panels off- they never want to go back on the same way for me