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Samsung Halts Galaxy Note 7 Production Temporarily (wsj.com)
Samsung is halting production of its Galaxy Note 7 smartphone after the replacement units -- the second batch of Note 7 produced -- by Samsung also seemed to be riddled with a similar issue, with nearly half a dozen of explosion and burning issues in the past week alone. Yonhap News Agency, and the WSJ are both reporting that the halt was done in cooperation with safety regulators from South Korea, China and the United States. From a WSJ report: Samsung's move comes after a spate of fresh reports of problems with replacement phones that have been distributed to consumers around the world. While Samsung hasn't confirmed the reports, it said in a statement Friday in response to one report that it would "move quickly to investigate the reported case to determine the cause and will share findings as soon as possible."
Sounds much more like an overheating CPU too close to a way to cheap poorly insulated battery (internal batteries are much cheaper than user replace able batteries). The CPU alters the conditions of the battery, so the battery generates more heat, heating the CPU which heats the battery (higher temperatures more electrical resistance, leading to higher temperatures). So the design is inherently bad and the phone has to be scrapped IMHO they kind of deserve it for removing user replacebale batteries from Notes, https://www.youtube.com/watch?..., I am a bad man ;D.
Chaos - everything, everywhere, everywhen
Phones have temperature sensors and will stop charging if the battery temperature gets too high, or throttle the CPU or even power off entirely if it gets too hot. Unless you leave it on the dash of your car in summer and the device can't control its temperature, heat can't really cause a catastrophic failure like this. It's more likely to be the battery developing an internal short circuit due to a manufacturing fault in my opinion. There's no way to handle that besides better quality control.