How To Fix System UI Has Stopped On Samsung Galaxy (2026)

Your Samsung Galaxy shows a “System UI has stopped” message, or the screen flickers, goes black or restarts the interface.

The error is common, and it usually comes from a bad app, a software bug or a stuck cache rather than broken hardware.

This guide works from the quickest fix to the last resort, and most people can finish the first few steps in about 10 minutes.

Quick answer: which fix should you try first?

What happened	Likely cause	Start with
Error began after installing or updating an app	Third-party app conflict	Safe mode, then uninstall the app
Error began after a system update	Software bug in the new version	Restart, check for a newer update
Error appears at random, even after restarts	Corrupted cache or settings	Wipe cache partition, then reset settings
Safe mode also shows the error	Not a third-party app	Software update, then Samsung support

Samsung Community threads show newer One UI versions often word it as “System UI isn’t responding,” and the same steps apply.

Fix 1: restart the phone

A restart clears the temporary glitch behind many one-off errors.

1. Press and hold the Side and Volume down buttons together, or swipe down from the top right and tap the Power icon.
2. Tap Restart.
3. Use the phone for a few minutes and see whether the message returns.

If the screen is frozen, see our guide to a Galaxy that keeps freezing or crashing.

Fix 2: test in Safe mode

Safe mode stops third-party apps from running, so it shows whether an app is causing the error.

1. Open the power menu, then touch and hold the Power off icon.
2. Tap the Safe mode icon.
3. Look for “Safe mode” in the bottom-left corner and use the phone normally.

If the error stops in Safe mode, a downloaded app is the cause.

If the power menu is unusable, turn the phone off, then power it on and hold Volume down while the Samsung logo shows.

To leave Safe mode, restart the phone, or open the “Safe mode is on” notification and tap Turn off.

Samsung notes that leaving Safe mode can reset some customizations such as wallpapers and themes; our Safe mode guide covers more.

Fix 3: remove the app that caused it

Samsung advises uninstalling the suspect app while in Safe mode, starting with apps that were installed or updated around when the problem began.

• Open Settings, then Apps.
• Pick the most recent suspect and tap Uninstall, or Disable if Uninstall is greyed out.
• Restart normally and test.

Remove one app at a time so you can tell which one fixed it.

Fix 4: install the latest software update

A system bug is the likely cause if Safe mode does not help, and updates are how Samsung ships fixes.

1. Open Settings.
2. Tap Software update or System updates (the name varies by model).
3. Tap Download and install, then follow the prompts.

Samsung says some carriers require Wi-Fi to check for updates, and that you may need to repeat the process more than once.

The phone cannot be used during installation, including for emergency calls, and a lost connection mid-update can make it fail.

Fix 5: wipe the cache partition

This clears temporary system cache from the recovery menu and, per Samsung, is separate from clearing a single app’s cache.

1. Switch the phone off.
2. Open the recovery menu with the combination for your model, as in the table below.
3. Use Volume up and Volume down to select Wipe cache partition, then press Power.
4. Select Yes, then Reboot device.

Phone type	Recovery button combination per Samsung
Physical Home button (such as S6, S7)	Volume Up + Home + Power; release Power when it vibrates
Separate Power button, no Home button (such as S8, S9, S10)	Volume Up + Bixby + Power until it vibrates and the logo appears
Neither (such as Note10, Fold, Z Flip)	Volume Up + Side until it vibrates and the logo appears

Menu names and button combinations vary by device, so check Samsung’s page for your model if the recovery menu does not appear.

Fix 6: reset app preferences

This clears default apps and restrictions that may be conflicting, and it keeps your saved app data.

1. Open Settings, then Apps.
2. Tap the three-dot menu at the top right.
3. Tap Reset app preferences, then Reset apps, and restart the phone.

It re-enables disabled apps and turns notifications back on, and it removes background data and permission restrictions you set.

Fix 7: reset all settings

Samsung’s Reset all settings returns general settings to their defaults while keeping apps, personal data and passwords.

Open Settings, tap General management, then Reset, then Reset all settings, and confirm with Reset settings and Reset.

Menu availability can vary by carrier, software version and model.

Last resort: factory data reset

Back up first. Samsung says Factory data reset erases everything, including apps, settings and personal files.

The path is Settings, then General management, then Reset, then Factory data reset, then Reset and Delete all.

Only do this if every earlier fix failed and the error also appears after a clean software update.

If the error keeps returning

Some Samsung Community reports describe System UI crashes after a One UI update that Safe mode did not reproduce.

In one thread, a Samsung moderator said the case had gone to Samsung’s technical team and gave no timeline, and one user said it stopped after a later security update, which Samsung has not confirmed.

Situation	Next move
Error only outside Safe mode	Remove recent apps, then update
Error after a One UI update, even in Safe mode	Install the next update; report it through Samsung support
Black screen with no response	See the black screen guide
Phone restarts repeatedly	See the restarting guide

Related guides: Galaxy black screen and Galaxy that keeps restarting.

When you contact Samsung, give your model, software version (Settings, About phone, Software information) and the steps you already tried; Samsung’s Safe mode page explains the testing step.