Uh oh, it sounds like the iPhone Duo keeps cracking and users aren’t happy about it

Newswire reports that Apple acknowledged on Monday that a limited number of its newly launched iPhone Duo foldable smartphones have inner-display problems. Newswire, Ada Derana and Hiru News report that Apple will replace affected devices; Newswire says the company advised customers with display problems to contact AppleCare.

Newswire reports that the iPhone Duo, which opens like a booklet, began shipping last week after initial online orders sold out within minutes. The outlet says users reported cracks and lines near the central hinge. Apple has not disclosed how many devices are affected or what caused the problem, according to Newswire.

Newswire reports that repair specialist iFixit’s preliminary analysis suggested a component in the folding mechanism might put pressure on the inner display. The outlet says iFixit used teardown footage, patents and CT scans to create a three-dimensional simulation, which indicated that a central support bar might not move far enough from the screen when the phone is folded. Newswire says Apple has not confirmed that explanation.

Newswire reports that iFixit described the iPhone Duo as the most repairable foldable phone it had tested. The outlet places the issue in the context of Apple entering a market where competitors, including Samsung, have already released multiple generations of foldable devices, and reports that analysts view Apple’s replacement offer as an early response to concerns about its first foldable phone.