Why this happens
Modern iPhones utilize advanced display technologies, such as ProMotion, which allows the screen’s refresh rate to dynamically adjust between 10Hz and 120Hz to optimize battery life and visual smoothness. When you are using certain system-intensive applications—like the Camera app for high-resolution capture or the Phone app during a call—the operating system may temporarily adjust the display’s performance profile. This adjustment is often related to resource management, power consumption, or the specific way the app interacts with the display hardware.
In some instances, this temporary adjustment fails to revert to the expected high refresh rate after the app is closed, leading to the screen remaining locked at a lower 60Hz rate. This behavior is typically a software interaction bug rather than a hardware failure.
Fixes to try
1. The Camera App Cycle (Most Likely Fix)
This is a specific workaround that has been reported by users experiencing this refresh rate drop. The action forces the system to re-evaluate the display’s performance state.
- Open the Camera app.
- Do not take a picture or record video; simply open the application.
- Immediately close the Camera app using the swipe gesture or the app switcher.
- Check if your iPhone’s refresh rate has returned to its expected high speed.
2. Force a Display Refresh
If the issue is related to a temporary software glitch, a simple restart can often resolve display inconsistencies.
- Press and hold the side button and either volume button until the power-off slider appears.
- Drag the power-off slider to shut down the device.
- Wait 30 seconds.
- Press and hold the side button again to restart your iPhone.
3. Check for iOS Updates
Apple frequently releases software updates to address performance bugs and improve system stability. If this refresh rate drop is a known bug in your current version of iOS, an update may contain a patch.
- Go to Settings.
- Tap General.
- Tap Software Update.
- Download and install any available updates.
4. Review Display Settings (General Check)
While the refresh rate is usually managed automatically, ensuring your display settings are not restricted can help prevent unintended performance drops.
- Go to Settings.
- Tap Accessibility.
- Tap Display & Text Size.
- Ensure that any features related to reduced motion or specific display scaling are set to your preferred, high-performance settings, unless you are intentionally trying to save battery.
If nothing works
If you have tried the Camera App Cycle, performed multiple restarts, and confirmed your iOS is running the latest version, the issue may require deeper investigation. In these cases, consider the following:
- Back up your data: Before attempting a factory reset, ensure all important data is backed up to iCloud or a computer.
- Contact Apple Support: Reach out to Apple Support directly. Provide them with the exact steps you have taken and the specific behavior you are observing. They can check for known, specific bugs tied to your device model and software version.
- Visit an Apple Store: A Genius Bar appointment can allow a technician to run diagnostic tests on your display hardware and software configuration.
FAQ
Does this happen with all iPhone models?
No. This issue is typically reported on iPhone models that support ProMotion (the variable refresh rate technology), which are generally the more recent and high-end models.
Is this a sign of a hardware failure?
While it is possible, the behavior described—where the rate drops after using a specific system app—is most commonly attributed to a software bug in the operating system’s resource management, not a hardware failure. However, if the issue persists across multiple software updates, it may warrant a hardware inspection.
How can I prevent the refresh rate from dropping entirely?
Currently, there is no setting within iOS to permanently lock the refresh rate to 120Hz without impacting battery life. The dynamic adjustment is a core feature of the operating system designed to balance performance and power consumption.