TLC NAND is singled out for iPhone 6, 6 Plus boot loops

By all accounts, the iPhone 6 and iPhone 6 Plus smartphones have been a huge success for Apple. Opening weekend sales for the devices broke records, and preorders for the smartphones in South Korea outnumbered those for the homegrown Samsung Galaxy Note 4 3:1.
However, there have been some hardware-related issues to contend with when it comes to the new smartphones (not to mention the iOS 8.0.1 debacle). The iPhone 6 Plus came under scrutiny for its propensity to bend in the pants pockets of users. Apple downplayed “bendgate”, but subsequent reporting has shown that the problem may be more widespread than initially thought.
Now, we’re hearing of issues surrounding the most expensive versions of the iPhone 6 and iPhone 6 Plus. Ever since the new iPhones were first released, there have been reports that owners of the 128GB models were experiencing frequent applications crashes and unexplained boot loop issues. The boot loop issue is the most severe, with the iPhone displaying a red or blue screen before rebooting over and over again. The boot loop problem requires that users take a trip the Apple Genius Bar for a replacement device.

BusinessKorea earlier this week surmised that the problem stems from the triple-level cell (TLC) NAND flash used in 128GB models of the iPhone 6 and iPhone 6 Plus. Today, the same publication stated that Apple will reportedly switch from TLC NAND to multi-level cell (MLC) NAND going forward for in the production of both the 64GB (users have reported similar issues with these devices, but to a much lesser extent) and 128GB iPhone 6/iPhone 6 Plus smartphones.
For those that are stuck with 128GB iPhones 6 and iPhone 6 Plus smartphones and haven’t yet been taken care of by Apple support, the issue will reportedly be at least partially rectified in software with iOS 8.1.1. iOS 8.1.1 is currently in beta testing.

Sources: BusinessKorea [1], [2], Apple Discussion Forums, Mac Rumors

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