iOS 27.0.1 Fixes the iPhone 18 Pro Face ID Restart Bug, but Not Battery Drain: What to Do Now (2026)

Your iPhone 18 Pro glances at you, doesn’t recognize you, and then the screen goes black and the Apple logo comes up. That was a real iOS 27 bug, and it’s the headline fix in iOS 27.0.1.

It’s a small update with a short changelog. The useful part is knowing which of your problems it actually covers. Battery complaints have been the loudest since iOS 27 shipped on September 14, and they aren’t on the list.

Jump Ahead

• What Does iOS 27.0.1 Fix?
• Why Did My iPhone 18 Pro Restart When Face ID Failed?
• Why Did My Touchscreen Stop Responding?
• What iOS 27.0.1 Leaves Alone
• Why Is My Battery Draining Faster Since iOS 27?
• How Do I Install iOS 27.0.1 Safely?
• Tips
• Warnings
• FAQ
• Sources

What Does iOS 27.0.1 Fix?

iOS 27.0.1, released by Apple on September 28, 2026, fixes three bugs: unexpected restarts on iPhone 18 Pro and Pro Max when Face ID fails to authenticate, a color artifact in some 2x photos taken at f/1.48 on a small number of those models, and an unresponsive touchscreen when Notification Center and Control Center are opened at the same time, according to 9to5Mac’s report of Apple’s release notes.

Table: our own summary of Apple’s iOS 27.0.1 release notes (via 9to5Mac), Apple’s security releases page, and TechSpot’s battery report, as of October 2, 2026.

When I checked Apple’s security releases page, I found that iOS 27.0.1 is listed for September 28, 2026 with the note “This update has no published CVE entries.” So it’s a pure bug-fix release. Install it for the fixes, not because of a security emergency.

Why Did My iPhone 18 Pro Restart When Face ID Failed?

On iOS 27.0, an iPhone 18 Pro or iPhone 18 Pro Max could restart unexpectedly when Face ID failed to authenticate, and Apple fixed that specific bug in iOS 27.0.1, so updating is the fix.

You’d usually hit it in ordinary moments. Sunglasses, a mask, a bad angle in bed. Face ID misses, and instead of falling back to the passcode screen, the phone reboots.

If it keeps happening after 27.0.1:

1. Confirm the version. Settings > General > About should show iOS 27.0.1.
2. Force restart once. Press and release volume up, then volume down, then hold the side button until the Apple logo appears.
3. Reset Face ID. Settings > Face ID & Passcode > Reset Face ID, then set it up again in good light.
4. Contact Apple Support if it still restarts. At that point it’s no longer the known bug.

Honestly, step 1 solves it for nearly everyone.

Why Did My Touchscreen Stop Responding?

On iOS 27.0, the iPhone touchscreen could become unresponsive when Notification Center and Control Center were opened at the same time, and Apple lists that exact bug as fixed in iOS 27.0.1.

This one isn’t limited to the iPhone 18 Pro. Any iPhone on iOS 27.0 could hit it.

If your screen locks up before you’ve updated, a force restart gets you out. Then install 27.0.1 so it doesn’t come back.

What iOS 27.0.1 Leaves Alone

Apple’s short changelog lists three fixes and nothing else. That leaves a few common complaints untouched:

• Battery drain since iOS 27. Not mentioned at all. More on that below.
• Slow search. I noticed that commenters under 9to5Mac’s release story were still reporting a roughly 10-second lag when searching contacts on an iPhone 17 Pro after updating. That’s a user report, not an Apple-acknowledged bug.
• Photos already affected by the camera artifact. The fix applies to new shots. Existing photos aren’t reprocessed.

If your problem isn’t on Apple’s list, updating won’t hurt, but don’t expect it to change anything.

Why Is My Battery Draining Faster Since iOS 27?

Faster battery drain after updating to iOS 27 usually comes from background work the iPhone does after installation, such as rebuilding search indexes, refreshing apps, downloading system assets, and preparing data for Siri and Apple Intelligence, and Apple says it does not harm the battery and should settle once processing finishes, according to TechSpot’s September 17, 2026 report.

The same report puts the heaviest drain in the first 24 to 48 hours, sometimes stretching to two or three days. Phones with big photo libraries take longer.

Here’s a sensible order of checks:

1. Plug in overnight on Wi-Fi for a couple of nights. Indexing goes faster when the phone is charging and idle.
2. Wait out day three. Judging battery life on day one after a major update tells you very little.
3. Open Settings > Battery and look at which apps used the most power in the last 24 hours. One misbehaving app is a common culprit after big updates.
4. Update your apps in the App Store. Developers often ship fixes for a new iOS in the first two weeks.
5. Check Battery Health under Settings > Battery. If maximum capacity is low, the update may just be exposing an aging battery.

Apple’s general battery performance guide covers the settings that matter most, such as screen brightness and Low Power Mode.

Still draining hard after a week? That’s when it’s worth contacting Apple Support.

How Do I Install iOS 27.0.1 Safely?

To install iOS 27.0.1, back up the iPhone to iCloud or a computer, connect to Wi-Fi and power, then go to Settings > General > Software Update and tap Update Now, as described in Apple’s Update your iPhone or iPad guide.

• Back up first. It’s a small update, but backups are cheap.
• Keep it plugged in. Updates need enough charge to finish.
• Expect one restart. A point release like this is quick on most phones.

If you’ve turned on automatic updates, it may already be installed. Check Settings > General > About.

Tips

• Turn on Automatic Updates so the next point release, likely iOS 27.1, installs overnight.
• After any iOS update, give the phone a couple of nights on the charger before judging battery life.
• Take a test 2x photo in mixed lighting after updating an iPhone 18 Pro, just to confirm the camera fix.

Warnings

• Don’t erase and restore your iPhone just to fix battery drain in the first few days. It restarts the indexing from scratch.
• Beware of “battery saver” apps promising to fix iOS 27 drain. iOS doesn’t let third-party apps manage background processes that way.
• Details here reflect Apple’s notes and reporting as of October 2, 2026. Apple may release further fixes.

FAQ

Does iOS 27.0.1 include security fixes?

No. Apple’s security releases page lists iOS 27.0.1 with no published CVE entries. It is a bug-fix update for Face ID restarts, a camera artifact, and a touchscreen freeze.

Is iOS 27.0.1 only for the iPhone 18 Pro?

No. Two of the three fixes target the iPhone 18 Pro and Pro Max, but the touchscreen freeze fix applies to other iPhones on iOS 27, so every compatible iPhone gets the update.

How long does battery drain last after updating to iOS 27?

Usually 24 to 48 hours, and sometimes two or three days. Apple says the background processing does not harm the battery and that battery life should return to normal when it finishes.

Sources

• Apple Support — Apple security releases
• Apple Support — Update your iPhone or iPad
• 9to5Mac — Apple releases iOS 27.0.1 for iPhone
• TechSpot — iOS 27 battery drain report

Fact-checked against Apple’s security releases and software update support pages, 9to5Mac’s report of the iOS 27.0.1 release notes, and TechSpot’s iOS 27 battery coverage as of October 2, 2026.