If I use an app that will turn up the fans and the heated air is pushed through the back vent below the screen it will not crack at all. If the laptop is open, and is in my lap, it will crack and pop every couple of minutes if I use it normally. After some research on the internet I found that a lot of people have the same issue and most think it is heat related. Mine was fine until 2 weeks ago, when one evening started popping and cracking from the back. I have the same noise coming from the back of my MacBook Pro. The OS X battery status is "Good", "No errors", Simplo model bq20z451, battery manufacture date 12-2-2016. Alternate explanations might be abnormal activation of haptic feedback, or flexing of internal components as adhesives or seals continue to cure since manufacturing (laptop manufacture date 12-19-2016). I think this is unlikely to be the cause, but is serious enough that I would like an alternative explanation before I disregard it. The case is not flexed or distorted in any way, there is no abnormal heat being generated, and no smoke, smells, or fumes. I'm not terribly bothered by the sound itself, but I'm aware that the battery is located roughly behind the trackpad, and I worry that an expanding battery might sound like this. I've had no other notable problems with this computer to date, have made no modifications to any hardware, or used it in any abnormal way. The sound is not very loud, but clearly audible, and sounds as if it is coming from approximately behind the trackpad. The sound is a single hollow "popping" noise, similar to if you slowly squeeze a plastic bottle until it crinkles. There is no association I can make with what I'm doing at the time, so I'm unable to recreate it. The sound occurs rarely, there may be several days or more straight that I don't hear it, though when it occurs, it may happen 2-3 times in a half hour period. Model is MacBook Pro 2016 with Touchbar, 15 inch, Radeon Pro 460, 2.9GhZ i7, 2TB SSD. I have heard a strange noice from my MBP, and am not sure if this is expected or not.
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