您的 iPhone 会不断自行重启吗？除非它是在系统软件更新(system software update)中，否则永远不会发生这种情况。但不要惊慌失措。虽然这很可能是硬件问题，但在得出该结论之前，您可以尝试多个修复程序。
下面一些更直接的解决方案应该可以帮助您让您的 iPhone 在大多数情况下正常运行。但是，如果重新启动持续到足以使设备几乎无法使用，您应该直接跳到最后并尝试在恢复模式(Recovery Mode)或DFU 模式下(DFU Mode)修复它。
1.更新系统软件
iOS 是一个非常稳定的移动操作系统，但在某些情况下，某些版本可能无法与特定的 iPhone 型号很好地融合。值得庆幸的是，Apple很快就在后续迭代中解决了问题，因此最好通过寻找并应用任何系统软件更新来开始工作。
如果您的 iPhone 可以长时间工作而没有任何自动重启，请前往“设置”(Settings ) > “通用(General )” > “软件更新(Software Update )” ，然后轻点“下载(Download )并安装(Install)”以更新设备。
或者，您可以使用Mac或 PC 来更新您的 iPhone。首先(Start)通过USB建立连接，然后打开Finder应用程序（macOS Catalina及更高版本）或 iTunes。然后，选择您的 iPhone 并选择检查更新(Check for updates)选项。
如果您的 iPhone 极其不稳定并且每隔几分钟或在启动时重新启动一次，您仍然可以在恢复模式下(Recovery Mode)对其进行更新。更多内容请参见下文。
2. 更新 iPhone 上的应用程序
未经优化的应用程序运行缓慢，最终耗尽了 iPhone 的电池电量。但很少，它们也会引发系统范围的崩溃。这通常发生在安装主要 iOS 版本之后，大多数应用程序仍在为之前版本设计的代码上运行。因此，您必须在任何应用更新发布后立即检查并安装它们。
为此，请长按App Store图标并选择更新(Updates)。然后，向下滑动屏幕以扫描新更新，然后点击全部更新(Update All)。
或者，您可以打开“设置”(Settings )应用，选择“应用商店”，然后打开“(App Store)应用更新(App Updates )”旁边的开关，以使设备上的应用自动保持最新。
您还可以通过转到Settings(Settings ) > General > iPhone Storage来删除未获得开发人员支持的过时应用程序。选择应用程序后，选择卸载应用(Offload App)程序仅删除应用程序，同时保持所有下载的文件和文档完好无损，或选择删除应用程序(Delete App)将其完全卸载。
3. 禁用iPhone上的(Your)后台应用程序(Background Apps)
在 iPhone 后台运行的有缺陷的应用程序是 iPhone(apps that run in the iPhone’s background)间歇性重启的另一个原因。尝试禁用它们。为此，请转到“设置”(Settings ) > “隐私(Privacy )” > “后台应用刷新(Background App Refresh )” ，然后关闭所有应用旁边的开关。
如果这有帮助，请逐步重新激活开关，直到遇到导致 iPhone 重新启动的应用程序。完成此操作后，请检查App Store是否有任何更新、联系应用程序开发人员以获得支持，或将其从您的设备中删除。
4. 取出你 iPhone 的 SIM 卡
有缺陷的 SIM 卡(defective SIM card)也可能导致系统软件崩溃。要检查这一点，请使用SIM 卡(SIM)弹出工具将SIM卡托盘从 iPhone 中取出。然后，在不重新插入SIM 卡(SIM)的情况下使用设备，检查是否会导致进一步重启。如果这有帮助，您必须向无线运营商申请更换卡。
5. 检查Lightning 端口(Lightning Port)、数据线(Cable)和充电器(Charger)
无法正确充电的 iPhone 有时也会重新启动。您可以尝试通过使用压缩空气或牙签清洁设备的 Lightning 端口上的任何棉绒或污垢来解决此问题。(cleaning the device’s Lightning port)开始使用不同的MFi 认证电缆(MFi-certified cable)来排除由磨损的USB线引起的问题也是一个好主意。
6. 检查 iPhone 的电池健康状况(Battery Health)
如果您使用 iPhone 一段时间，电池可能无法保持足够的电量。转到设置(Settings )>电池(Battery )>电池健康(Battery Health )以检查电池的健康状况。理想情况下，它应该在 80% 以上。如果不是，请将您的 iPhone 带到Apple并更换电池。
或者，您可以在将 iPhone 连接到Mac或 PC时使用椰子(iMazing)电池或iMazing等应用程序来确定电池健康状况。(coconutBattery)
7.将所有设置重置为默认值
iPhone 带有许多设置，可帮助您自定义操作系统和运行在其上的各种应用程序的体验。但是，这也可能导致冲突并导致您的 iPhone 不断重启。
因此，请尝试重置 iPhone 上的设置并检查是否有帮助。为此，请前往“设置”(Settings ) > “通用(General )” > “传输或重置 iPhone(Transfer or Reset iPhone ) ” > “重置(Reset )” ，然后点击“重置所有设置”(Reset All Settings)。
8. 恢复出厂设置你的 iPhone
如果上述修复都没有帮助，您可能需要考虑将 iPhone 重置为出厂设置(resetting your iPhone to factory settings)。如果您有数据备份，则可以选择在重置过程后恢复该数据。如果没有，您必须在尝试重置之前将数据备份到 iCloud 或计算机。(back up your data to iCloud or a computer)
要将 iPhone 重置为出厂默认设置，请前往“设置”(Settings ) > “通用(General )” > “传输或重置 iPhone(Transfer or Reset iPhone ) ” > “重置(Reset )” ，然后选择“抹掉所有内容和设置”(Erase All Content and Settings)。或者，您可以将设备直接连接到Mac或 PC 并选择“恢复 iPhone”(Restore iPhone)。
9. 进入并使用恢复模式
如果您在与 iPhone 交互时遇到问题，则必须进入并使用恢复模式(Recovery Mode)。该功能可让您修复遇到严重问题的 iOS 设备。但是，您只能通过Mac或 PC与恢复模式进行交互。(Recovery Mode)
强制重启 iPhone 并进入恢复模式(Recovery Mode)后（您可以在此处找到设备特定说明(find device-specific instructions here)），您可以选择重新安装系统软件而不会丢失数据。为此，请选择更新(Update)。
如果这没有帮助，您必须使用“恢复 iPhone”(Restore iPhone )选项将 iPhone 重置为出厂设置。但是，如果您没有数据备份，您将丢失设备本地存储的所有内容。
10.进入和使用DFU模式
如果恢复模式(Recovery Mode)不起作用（或者如果您无法进入），您应该尝试在设备固件更新(Device Firmware Update)（或DFU）模式下(Mode)恢复您的设备。它的工作原理类似于恢复模式(Recovery Mode)，但它通过重新安装系统软件和设备固件来帮助解决硬件级别的问题。
进入DFU 模式(DFU Mode)后（同样，您可以在此处找到特定于设备的说明(find device-specific instructions here)），选择恢复 iPhone(Restore iPhone )选项以将您的 iPhone 恢复为出厂默认设置。
警告：(Warning:)如果您的 iPhone 遭受任何外部损坏（例如，如果您的 iPhone 掉落），请避免进入和使用DFU 模式(DFU Mode)。
是时候参观苹果商店了
您已尽一切可能修复您的 iPhone。但如果它继续重新启动，则可以安全地假设问题是特定于硬件的。因此，您最好的做法是将设备带到 Apple Store(take the device to an Apple Store)或Apple 授权维修服务处(Apple Authorized Repair Service)。
iPhone Keeps Restarting? 10 Ways to Fix
Does yoυr iPhone keep reѕtarting on its own? Unless it was in the midst оf a system software update, that should never happen. But don’t freak out just yet. While it could very well be an issue with the hardware, you’ve got multiple fixes that you can attempt before coming to that conclusion.
Some of the more straightforward solutions below should help you get your iPhone functioning correctly most of the time. But if the restarts are continuous enough to make the device barely usable, you should skip right toward the end and attempt to fix it in Recovery Mode or DFU Mode.
1. Update the System Software
iOS is an incredibly stable mobile operating system, but rarely, some releases may not gel well with specific iPhone models. Thankfully, Apple is quick to iron out issues in subsequent iterations, so It’s best to kick things off by looking for—and applying—any system software updates.
If your iPhone works for extended periods without any automatic restarts, then go to Settings > General > Software Update and tap Download and Install to update the device.
Alternatively, you can use a Mac or PC to update your iPhone. Start by establishing a connection via USB and open the Finder app (macOS Catalina and later) or iTunes. Then, select your iPhone and choose the Check for updates option.
If your iPhone is extremely unstable and restarts once every few minutes or at startup, you can still update it in Recovery Mode. More on that further below.
2. Update the Apps on Your iPhone
Unoptimized apps run sluggishly and end up draining the battery on your iPhone. But rarely, they also induce system-wide crashes. That usually happens right after installing a major iOS version, with most apps still running on code designed for the previous release. So you must continually check for and install any app updates as soon as they’re released.
To do that, long-press the App Store icon and select Updates. Then, swipe down the screen to scan for new updates and follow by tapping Update All.
Alternatively, you can open the Settings app, select App Store, and turn on the switch next to App Updates to keep the apps on your device up-to-date automatically.
You can also remove outdated apps that don’t receive developer support by heading over to Settings > General > iPhone Storage. After selecting an app, choose Offload App to delete the app only while keeping any downloaded files and documents intact, or choose Delete App to uninstall it completely.
3. Disable Background Apps on Your iPhone
Buggy apps that run in the iPhone’s background are another reason for intermittent iPhone restarts. Try disabling them. To do that, go to Settings > Privacy > Background App Refresh and turn off the switches next to all apps.
If that helps, gradually reactivate the switches one by one until you come across the app causing the iPhone to restart. Once you’ve done that, check the App Store for any updates, contact the app developer for support, or delete it from your device.
4. Take Out Your iPhone’s SIM
A defective SIM card might also cause the system software to crash. To check that, use a SIM ejector tool to take the SIM tray out of your iPhone. Then, use the device without re-inserting the SIM to check if that causes any further restarts. If that helps, you must request a replacement card from your wireless carrier.
5. Check the Lightning Port, Cable, and Charger
An iPhone that fails to charge correctly can also restart occasionally. You can attempt to fix that by cleaning the device’s Lightning port of any lint or dirt with compressed air or a toothpick. It’s also a good idea to start using a different MFi-certified cable to rule out issues caused by a frayed USB cord.
6. Check Your iPhone’s Battery Health
If you’ve used your iPhone for a while, the battery might be incapable of holding sufficient charge. Go to Settings > Battery > Battery Health to check the battery’s health. Ideally, it should be above 80%. If it isn’t, take your iPhone to Apple and get the battery replaced.
Alternatively, you can use an app such as coconutBattery or iMazing to determine battery health while having your iPhone connected to a Mac or PC.
7. Reset All Settings to Defaults
The iPhone comes with many settings to help you customize your experience with the operating system and the various apps that run on it. However, that can also result in conflicts and cause your iPhone to keep restarting.
So try resetting the settings on your iPhone and check if that helps. To do that, go to Settings > General > Transfer or Reset iPhone > Reset and tap Reset All Settings.
8. Factory Reset Your iPhone
If none of the fixes above helped, you might want to consider resetting your iPhone to factory settings. If you have a backup of your data, you can choose to restore that after the reset procedure. If not, you must back up your data to iCloud or a computer before attempting the reset.
To reset your iPhone to factory defaults, go to Settings > General > Transfer or Reset iPhone > Reset and select Erase All Content and Settings. Or you can connect the device directly to a Mac or PC and choose Restore iPhone.
9. Enter and Use Recovery Mode
If you have trouble interacting with your iPhone, you must enter and use Recovery Mode. It’s a feature that allows you to fix an iOS device that experiences severe issues. However, you can only interact with Recovery Mode via a Mac or a PC.
After force-restarting your iPhone and entering Recovery Mode (you can find device-specific instructions here), you can choose to reinstall the system software without losing your data. To do that, select Update.
If that doesn’t help, you must use the Restore iPhone option to reset the iPhone to factory settings. However, if you don’t have a backup of your data, you’ll lose everything stored locally on the device.
10. Enter and Use DFU Mode
If Recovery Mode doesn’t work (or if you can’t enter it), you should try restoring your device in Device Firmware Update (or DFU) Mode. It works similar to Recovery Mode, but it helps fix issues at the hardware level by reinstalling both the system software and the device firmware.
After entering DFU Mode (again, you can find device-specific instructions here), select the Restore iPhone option to restore your iPhone to factory defaults.
Warning: If your iPhone has suffered any external damages (if you dropped your iPhone, for example), avoid entering and using DFU Mode.
Time to Visit an Apple Store
You’ve done everything possible to fix your iPhone. But if it continues to restart, it’s safe to assume that the issue is hardware-specific. So your best course of action should be to take the device to an Apple Store or an Apple Authorized Repair Service.
