How to Fix a Phone That Keeps Restarting Randomly (iPhone & Android)

You’re scrolling, texting, or calling—and suddenly your phone restarts out of nowhere. No warning, no reason. Frustrating, right? A phone that keeps restarting randomly can disrupt your day, cause data loss, and even point to serious hardware issues.

Whether you use an iPhone or Android, this guide breaks down the causes, quick fixes, and repair options—so you can stop the reboot loop and get back to normal.

At Cellular Zone SA, our technicians deal with restart issues daily. With years of repair experience, we’ve seen it all—from corrupted apps to faulty batteries. This article will help you troubleshoot safely and know when it’s time for a professional repair.

Common Causes Behind Random Phone Restarts

Before fixing the problem, it’s important to understand why it happens. Here are the most frequent reasons:

1. Software Glitches or OS Bugs

A corrupted system update, malware, or app conflict can trigger endless restarts.

2. Overheating Issues

Phones automatically reboot when they reach unsafe temperatures to prevent damage.

3. Battery or Power Problems

A swollen, aging, or unstable battery can’t maintain consistent voltage, leading to reboots.

4. Faulty Apps or Background Services

An app running with corrupted cache or background permissions may crash the system.

5. Damaged Motherboard or Power IC

If your phone restarts even in Safe Mode, hardware damage is possible—often requiring repair.

6. Loose Connections or Water Exposure

Physical drops, moisture, or debris inside can short internal contacts, forcing restarts.

According to Android Authority, the majority of random restarts are linked to unstable software or battery-related issues.

Step-by-Step Fixes for Random Restarts

Now let’s walk through the most effective solutions. Try these in order—from the easiest to the most advanced.

1. Restart the Phone in Safe Mode

Safe Mode loads only system apps, disabling third-party ones temporarily.

On Android: Hold the Power button → Long-press “Power Off” → Tap “Safe Mode.”
On iPhone: There’s no true Safe Mode, but you can uninstall suspicious apps manually.

If your phone doesn’t restart while in Safe Mode, one of your installed apps is likely to blame.

2. Update or Remove Problematic Apps

Go through your recently downloaded or updated apps.

Uninstall any app installed right before the issue started.
Update all remaining apps via Play Store or App Store.

3. Free Up Storage Space

Low storage can cause instability. Delete unused files, videos, and apps.

iPhone: Settings → General → iPhone Storage.
Android: Settings → Storage → Manage Storage.

Keep at least 2GB of free space for stable operation.

4. Check for Software Updates

System updates often fix known reboot bugs.

iPhone: Settings → General → Software Update.
Android: Settings → System → Software Update.

If your phone’s OS is outdated, update it now.

5. Reset Settings (Without Deleting Data)

Resetting settings refreshes system preferences and clears conflicting configurations.

iPhone: Settings → General → Reset → Reset All Settings.
Android: Settings → System → Reset options → Reset settings.

6. Inspect Battery Health

Weak or failing batteries are a major cause of restarts.

iPhone: Settings → Battery → Battery Health & Charging.
Android: Use “AccuBattery” app or visit a repair center for diagnostics.

If your battery is swollen or drops charge suddenly, replace it immediately.

7. Avoid Overheating

Continuous overheating restarts your phone to prevent hardware failure.

Tips:

Don’t use your phone while charging.
Avoid direct sunlight and heavy gaming for extended periods.
Remove the case when the phone feels hot.

8. Factory Reset (Last Resort)

If nothing else works, do a complete factory reset after backup.

iPhone: Settings → General → Transfer or Reset → Erase All Content and Settings.
Android: Settings → System → Reset → Factory data reset.

This erases everything, so only do it when absolutely necessary.

Hardware Solutions (If the Problem Persists)

If random restarts continue, hardware issues may be at fault.

1. Check Charging Port and Connectors

Loose ports or broken charging pins can interrupt power flow. A simple port cleaning or solder reflow may solve it.

2. Replace Battery

If diagnostics confirm a weak battery, replacing it usually resolves restarts instantly.

3. Power IC or Logic Board Repair

If the issue is electrical (e.g., damaged Power Management IC), a technician can replace or resolder the affected chip.

Our team at Cellular Zone SA uses advanced tools for board-level repairs and genuine parts replacement.

Prevent Future Random Restarts

Once fixed, keep your device healthy:

Keep OS & apps updated regularly.
Avoid installing from unverified sources.
Use official chargers and cables.
Clear cache monthly for better performance.
Don’t overload background tasks or storage.

Small habits prevent big headaches!

When to Seek Professional Help

If you’ve tried every solution and your phone still restarts, the issue likely involves hardware or deep system faults.

Our trained technicians can:

Run diagnostics on logic boards and batteries.
Repair or replace damaged internal parts.
Back up and restore data securely.

Visit our Book an Appointment page or stop by any of our Locations for expert repair support.

We also offer options to Buy a Device or Sell Your Mobile Device if your current phone is beyond repair.

Conclusion

A phone that keeps restarting isn’t just annoying—it’s a red flag. Most times, the culprit is software or battery-related, and the fixes are simple. But if reboots persist after resets, it’s time for professional help.

At Cellular Zone SA, we specialize in diagnosing complex restart issues fast and affordably. Don’t let your device disrupt your day—book your repair today and get your phone running smoothly again.

FAQs

Q1: Why does my phone restart when charging?
A damaged charging cable or faulty battery may cause unstable voltage spikes, forcing automatic reboots.

Q2: Can overheating cause random restarts?
Yes. When internal temperatures exceed safe limits, your phone restarts to protect the motherboard.

Q3: Is it safe to keep using a phone that restarts on its own?
Not recommended. It can lead to file corruption, missed calls, and permanent data loss.

Q4: Will factory resetting fix my restart issue?
If it’s software-related, yes. But hardware problems require professional inspection.

Got Questions? We’ve Got Answers.

Common How to Fix a Phone That Keeps Restarting Randomly Repair Problems

Speaker Replacement

Noticed your audio cutting in and out? You may have a speaker problem. Our techs are experts at speaker repair and can get your audio working like new.

Screen Repair

Cracked or shattered screens are all too common, even from a short drop. We carry all of the high quality parts to get your screen repaired quickly.

Battery Replacement

Batteries age over time and lose their ability to hold a full charge. We can replace your battery and restore your device to full performance.