Widespread iPhone Performance Issues
iPhone Users Report Sluggish Performance and Restarts Following iOS 27 Update
Anonymous
iPhone users report that iOS 27 has caused sluggish or unresponsive interfaces, choppy animations, faster battery drain, overheating and unexpected restarts across newer and older models. Some restart reports involve iPhone 18 Pro models, including incidents during Face ID use; Apple is preparing a software update to address a reported restart issue. Other accounts describe a temporary interface lock triggered by quickly opening Notification Center and Control Center, while reports of touchscreens that remain unusable appear to be a separate and potentially more serious problem. The cause of the broader performance and battery complaints remains unclear, and the reports do not establish that all issues share one cause.
Key Points
1
Some users specifically reported that changing Home Screen widgets could crash the entire interface, requiring a restart to restore normal operation; this is a separate reported trigger from the Notification Center/Control Center gesture issue.
2
The gesture-triggered lockup was not consistently reproducible: 9to5Mac reportedly reproduced it on an iPhone Air running iOS 27.0, while AppleInsider and CNET did not reproduce the same full freeze on their tests.
3
For unexpected restarts, affected owners can check Analytics Data for files beginning “panic-full” and compare report timestamps with restart times; the presence of such a report does not, by itself, establish a hardware fault.
4
Some owners said Apple had agreed to replace restarting iPhones, but users disagreed over whether the restarts were caused by hardware or software.
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