Do these 3 things before closing this tab:
1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteIf your Samsung Galaxy keeps restarting, first check whether an automatic restart or security update explains the timing. Next, test the phone in Safe mode: if it stays on, a downloaded app may be responsible; if it still reboots, a hardware problem becomes more likely. The steps below move from low-risk checks to service or, only as a last resort, a factory reset.
Why does your Samsung keep restarting?
The timing and pattern can help narrow down the cause, but an unexpected restart does not point to one universal fault. A schedule or automatic-optimisation setting may explain predictable restarts; a recently installed app is worth checking if the problem began around the same time; and persistent reboots in Safe mode make a hardware issue more likely. A phone that cannot reach the lock screen or keeps restarting during an update may be in a boot loop.
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Samsung says menu names and available settings vary by model, software version, and location. Treat the paths below as approximate; if a label is different, search for it in Settings.
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Check whether the restart is expected
Review automatic restart settings
On some Galaxy devices, Auto optimisation can restart the phone when needed, and a scheduled Auto restart can reboot it at a set time. Look under Settings > Device care or Battery and device care > Auto optimisation > Auto restart. If the restart pattern matches a setting, adjust or turn off that option and observe whether the pattern changes. Samsung cautions that a system restart may still occur depending on the device’s condition.
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Samsung India’s guidance says the automatic restart feature generally runs only when the phone is idle, its screen is off, and its battery is at least 30%. That figure is a condition for the feature described in that regional guidance—not a general battery-health threshold. Samsung’s Auto restart guidance was updated on August 18, 2026.
Consider whether a security update triggered it
Samsung says an emergency security update may restart a device automatically even when automatic software downloads are turned off. This depends on the country or region, so it is one possible explanation rather than a default cause. Samsung’s regional guidance describes this behavior.
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Test for a downloaded app with Safe mode
Safe mode starts the phone with core software and disables downloaded apps. It is a useful way to separate app-related trouble from a problem that persists without those apps running.
- Open the power menu. On supported recent devices, press and hold the Side and Volume down buttons together.
- Touch and hold Power off, then select Safe mode when the option appears. The button combination and labels can vary by model.
- Use the phone long enough to see whether the unexpected restarts continue.
- If the phone stays on in Safe mode, uninstall recently added or updated apps one at a time, restarting normally and checking the behavior after each removal.
If the reboots stop in Safe mode, investigate downloaded apps first. If they continue, an app is less likely to be the cause. Samsung says an issue that persists in Safe mode is more likely to be hardware-related. See Samsung’s unexpected power-off troubleshooting guide and its boot-loop guidance.
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Check software updates and identify a boot loop
If the phone can reach Settings
Open Settings > Software update and install an available update over a reliable connection, following the on-screen prompts. If the phone restarts repeatedly during an update, or you cannot reach the lock screen, do not treat it as an ordinary random restart: follow Samsung’s instructions for a device that will not start or is in a boot loop. Samsung describes Smart Switch as another update route when available.
If it repeatedly returns to the startup screen
A phone that never completes startup, cannot reach the lock screen, or cycles through restarts during an update fits the boot-loop scenario covered by Samsung’s dedicated guidance. Use that guide or contact Samsung support rather than repeatedly trying unrelated settings. Samsung’s boot-loop guide covers this situation.
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Rule out a button, accessory, or charging issue
- Remove the case and accessories: check that nothing is pressing or obstructing the Power/Side button. Samsung notes that a jammed or unusually soft button can contribute to unexpected shutdowns.
- Consider the battery state: if the phone may simply be discharged, connect a Samsung-certified charger and cable and allow it to charge. A blank display does not necessarily mean charging has failed. Charging is a check for a potentially discharged phone, not a general fix for random restarts.
- Look for physical damage: suspected damage or a battery problem warrants professional inspection; do not open the phone or attempt an undocumented battery replacement.
These checks are included in Samsung’s U.S. unexpected power-off guide.
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Arrange professional help if the phone keeps restarting in Safe mode, has physical damage, or shows signs of a battery problem. If the supported software and troubleshooting steps do not resolve the issue, Samsung recommends contacting a walk-in or authorized service center. The Samsung Philippines repeated-reboot guide also points readers toward service when troubleshooting fails.
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Use a factory reset only as a last resort
A factory data reset erases personal data. Try the preceding checks first. If you decide to reset, back up important data, confirm you know the account credentials needed to set the phone up again, and decrypt an encrypted SD card if applicable. After the reset, test the phone before restoring apps; reinstalling a problematic app could bring the issue back. Samsung’s unexpected power-off guide and boot-loop guide cover reset as a later troubleshooting step.
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