Samsung Galaxy keeps restarting? 7 things to check

By Saadat Rafiq · 2 min read · 7 steps · Updated 5 October 2026 · ▶ Video demo

Device

Android

Shown on

Samsung Galaxy A57 5G (SM-A576B), One UI 8.5, Android 16

App

Settings

Real screenshots

4 of 7 steps

Checked

October 2026

Sources

2 official, linked below

Step by step

1. 

   Open Auto optimization

   Open Settings, Device care and scroll down to Auto optimization.

   Done

2. 

   Check Auto restart

   It restarts the phone when it is idle, on a schedule or when memory runs low. Ours was off. Samsung recommends leaving it on if you never restart the phone yourself, so expect night-time restarts while it is on.

   Done

3. 

   Check Inactivity restart

   Settings, Security and privacy, More security settings. When on, a phone that stays locked for 72 hours restarts itself for security. It was off on ours.

   Done

4. Remove recently installed apps

   An unstable app is the most common real cause. Uninstall the apps you added just before the restarts began, one at a time, and test after each one.

   Done

5. 

   Install the latest software

   Settings, Software update, Check for updates. Our phone was on One UI 8.5.

   Done

6. Run a diagnostic test

   Open the Samsung Members app, tap Support, then Phone diagnostics, and test the battery and the other parts it offers.

   Done

7. Still restarting? Back up and get it checked

   Back up your data. If the restarts continue with no new apps installed, a battery or hardware fault is likely, and a Samsung service centre can test it.

   Done

About this guide

Samsung lists three features that restart a Galaxy by design: Auto optimization, Auto restart and, from One UI 8, Inactivity restart. Rule those out before looking for a fault. A restart right after a security update is also normal.

The screenshots are from a Samsung Galaxy A57 5G with One UI 8.5 and Android 16. Other Galaxy phones on One UI 8 use the same menus; on older One UI versions a few names and positions differ. We only looked at these screens on our phone and changed nothing.

Good to know

A worn battery can switch the phone off under load: how to check battery health on a Samsung Galaxy phone.

Before handing the phone in: how to use Maintenance mode on a Samsung Galaxy before a repair.

In short: Auto restart (Device care, Auto optimization) and Inactivity restart (More security settings) off or expected; then remove new apps, update, run diagnostics.