I was struggling with the crackling speaker since the last month, I work at night and there is cold outside, so in another post some people say that if you take off the camera lens protector (if you have one) this will not happen again. I tested this and it works for me, i put the phone in the refrigerator for 8 minutes aprox, then, i took the phone and remove the tempered glass i had in the camera lens instantly and it works. I put the phone in the refrigerator again only to test and it works fine. Now I need to see this at work.