Namely in those that have been, at any point in the past, repaired with third-party screens. The exact nature of the glitch is unknown; what we know is that the microchip of many of the 3rd party-repaired iPhones are suddenly not working anymore. The issue was first reported (at least in media) by Motherboard, who spoke about it with the CEO of an US iPhone repair shop. According to the CEO, the iOS 11.3 glitch has caused his company over two thousand reshipments by now. He also suggested that Apple is doing it on purpose in order to turn its customers away from 3rd party repair services. If true, this tactic is another example of a large company playing dirty. It is true that using 3rd party services for your phone is a risk, but it is also not up to Apple to make that decision, or at least should not be.
Apple has yet to officially comment on the situation. What do you think?