I am one of the unlucky ones with MacBook pro 15 2018 that has crackling speakers. It happens only occasionally. In fact, it only happened three times within the 3 weeks since I had it. And killing the coreaudiod process fixed it every time. Also I experienced a different but related issue: when I play videos on youtube with chrome or safari, the videos just quickly fast forward to the end. It happened only once and killing coreaudiod also fixed it. I talked to apple support over the phone and was told that I could bring it back to apple store for a replacement. I am wondering if it is worth it. On one hand, most people believe that this is a software issue, eventually system update will fix it. (By the way, I am running High Sierra with latest patches). On the other hand, some people just never experience it and new unit replacements seem to fix for others. So I want to hear from those who have or had this issue. Did the system patches (2018-002 and 2018-003) fix the issue for you? How many of you have any luck with replacement units? And for those who still have the issue, are you going to wait it out for new patches? Another reason why I am a little reluctant for replacement is that I heard something about replacements not always being new ones. Sometimes Apple uses refurbished, open-box, or exchanges devices for replacement. I wonder if it is true. Thank you all and have a happy holiday.