I have a 15" MacBook Pro TouchBar with 16GB ram, 512GB SSD and the Radeon Pro 455. Every once in a while, at least a couple times a day, it pops. It sounds like someone inside the computer is knocking the inside of the case with their finger. It's really strange. Has anyone else ever encountered this? Does my computer need an exorcism? Is it just about to explode? ETA: After using the search feature, which I probably should have started with, I see that I am not the only one this is happening to. There does not appear to be any resolution to the issue either, unless I'm missing something.