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If your Samsung Galaxy keeps restarting at random, first check its automatic restart settings, then use Safe mode to test whether a downloaded app is involved. A restart during a software update can be normal; repeated restarts at unrelated times need troubleshooting. Follow the steps below in order, and note when the behavior changes.
Start by looking for a pattern
Before changing settings, note when the phone restarts: at a similar time each day, while idle, after an update or app installation, while charging, or during a particular task. Samsung identifies scheduled timing as a clue to an automatic restart setting, while irregular restarts can accompany app or update issues. These are clues, not proof of a particular cause.
Check automatic restart settings
On supported software, open Settings > Device care > Auto optimisation > Auto restart. Review Restart when needed and Restart on schedule; turn off any setting you do not want active, then watch whether the usual pattern changes. Menu names and locations can differ by model and software version. Samsung India explains Auto optimisation and Auto restart.
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Use Safe mode to check downloaded apps
Safe mode runs the phone with core apps and disables downloaded apps, making it a useful way to test whether a third-party app may be involved. Samsung describes it as a way to determine whether a third-party application is causing an issue. See Samsung US instructions for using Safe mode.
- Open the phone’s Power menu. Depending on the model, you may reach it from the Quick panel or by holding the side and volume buttons.
- Touch and hold Power off until the Safe mode option appears, then select it. The button sequence can vary by model.
- Use the phone as you normally would for long enough to see whether the usual restart happens. If it stops, remove apps installed or updated around the time the problem began, one at a time, testing after each removal.
If the Galaxy still restarts in Safe mode, downloaded apps become a less likely explanation. That does not identify a specific hardware fault, but it makes app removal a less promising next step.
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Check for a software update and run diagnostics
Open Settings > Software update and follow the on-screen instructions to check for and install an available update. Samsung’s repeated-restart guidance recommends an internet connection and sufficient free storage, and says to charge the phone to at least 50% before updating; some carriers require Wi-Fi. The device may reboot during installation. Samsung US provides software-update and restart troubleshooting guidance.
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If the Samsung Members app and its Phone diagnostics feature are available on your device, you can also run the relevant checks there. Availability and diagnostic options vary by device. Samsung Australia explains the Samsung Members app.
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Use the results to choose the next step
| What you observe | What it suggests | What to do next |
|---|---|---|
| Restarts follow a schedule or happen while idle with the screen off | An automatic restart setting is worth checking; timing alone does not confirm it. | Review Auto restart options and observe whether the pattern changes. |
| The issue began after an app installation or update, and stops in Safe mode | A downloaded app is more plausible. | Remove recently installed or updated apps one at a time, testing between removals. |
| The issue continues in Safe mode | Downloaded apps are less likely to be responsible. | Check for system updates and consider Samsung Members diagnostics if available. |
| The issue remains after troubleshooting or returns after a reset | The available checks have not resolved it; the cause may require device-specific assessment. | Contact Samsung support or an authorized service provider. |
Back up before considering a factory reset
A factory reset erases personal data, so treat it as a later troubleshooting step, not the first response to a restart. Back up important information before resetting; Samsung describes cloud and account options as well as removable USB or SD storage, where supported. A compatible USB-C flash drive may be one backup option, but it does not fix the restart problem. After resetting, test the phone before reinstalling downloaded apps so you can see whether the issue returns without them. Samsung explains how to back up and restore Galaxy data.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.When to contact Samsung service
Contact Samsung support or an authorized service provider if the phone keeps restarting in Safe mode or after a factory reset. Those results do not prove a particular part has failed; they indicate that the built-in app checks have not isolated or resolved the problem. Service availability and routes vary by market.
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