When your Fairphone 5 starts restarting on its own, it can be incredibly disruptive. This is often a software hiccup, but with its modular design, there are a few hardware checks that are easier to perform than on most phones. I'd start with the simplest fix first.
Before you begin, it's a good idea to ensure your data is backed up. You can use Google Drive or the backup feature in your phone's settings. This protects your photos, contacts, and app data just in case.
Perform a Force Restart
The quickest way to stop a random restart loop is to force restart the phone. This clears the device's memory and can fix temporary glitches. For the Fairphone 5, you have two main methods.
First, try pressing and holding the Power button for at least 10 seconds. Keep holding it until you see the Fairphone logo appear on the screen, then release. If that doesn't work, you can use the unique advantage of a modular phone.
Power the phone off completely. Then, pop off the back cover and carefully remove the battery. Wait about 30 seconds before reinserting the battery and putting the cover back on. Press the Power button to turn it on normally.
Check for Problematic Apps
A misbehaving app is a very common cause of random restarts. Start by checking which apps you've installed or updated recently. You can boot the phone into Safe Mode to see if the problem stops.
To enter Safe Mode, press and hold the Power button until the power off menu appears. Then, tap and hold the "Power off" option on your screen. A prompt will ask if you want to reboot to Safe Mode. Tap "OK".
If the phone runs stable in Safe Mode, a third-party app is likely the culprit. You'll need to uninstall apps one by one, starting with the most recent, to find the offender. Remember to restart normally to exit Safe Mode.
Update Your Apps and Android
Outdated software can cause conflicts that lead to crashes. First, update all your apps through the Google Play Store. Open the Play Store, tap your profile icon, and go to Manage apps & device.
Under "Updates available," tap "Update all". Next, check for a system update. Fairphone is committed to long-term support, so regular updates are crucial. Go to Settings > System > System update.
Download and install any available update. These updates often include important bug fixes and security patches that can resolve stability issues causing the restarts.
Free Up Storage Space
If your phone's storage is nearly full, the system can become unstable. Android needs free space to operate properly. Go to Settings > Storage to see how much space you have left.
If you're below 10% free space, it's time to clean up. You can offload old photos and videos to the cloud, clear app caches, or uninstall apps you no longer use. This simple step can surprisingly resolve a lot of performance issues.
Inspect and Reseat the Battery
One of the Fairphone's best features is its user-replaceable battery. A loose connection could cause intermittent power loss, mimicking a restart. Power down the phone completely and remove the back cover.
Take out the battery and inspect the gold contacts on both the battery and the phone's interior. Look for any dust, lint, or corrosion. Gently clean the contacts with a dry cotton swab if needed.
Reinsert the battery firmly, ensuring it clicks into place. This is also a good time to consider if your battery is aging. If you have a spare, try swapping it in to see if the problem persists.
Reset App Preferences or Network Settings
Sometimes, corrupted system settings can cause instability. You can reset specific settings without losing your personal data. Go to Settings > System > Reset options.
Here, you can try Reset app preferences. This resets permissions, background data restrictions, and default apps without deleting the apps themselves. If you suspect a network issue, Reset Wi-Fi, mobile & Bluetooth can help.
You'll need to re-enter Wi-Fi passwords and re-pair Bluetooth devices afterward, but it can eliminate conflicts causing the system to crash.
Check for Overheating
The Fairphone 5's modular design can make it slightly thicker, which sometimes affects heat dissipation. If the phone gets too hot, it will protect itself by shutting down or restarting.
Feel the back of the phone during use. Is it unusually warm, especially near the camera module or processor area? Avoid using it while charging with a fast 30W charger, as this generates more heat.
Remove the case if you're using one, and try to use the phone in a cooler environment. Persistent overheating might point to a background app running wild or, less commonly, a hardware concern.
Perform a Factory Reset
If all else fails, a factory reset is the most thorough software fix. This will erase all data on your phone, so double-check your backups first. Go to Settings > System > Reset options.
Select Erase all data (factory reset). You'll need to enter your PIN, pattern, or password to confirm. The phone will reboot and take several minutes to wipe itself clean.
After the reset, set up the phone as new without immediately restoring a backup. Test it for a while to see if the restarting issue is gone. If it is, you can then slowly reintroduce your apps.
Consider a Software Reflash via Fastboot
For persistent software corruption that a factory reset doesn't fix, you may need to reflash the device software. This requires a computer and some comfort with command-line tools like ADB and Fastboot.
You'll need to download the official Fairphone OS image from Fairphone's website. This process, often called "flashing a stock ROM," completely reinstalls the operating system. It's the most definitive software solution.
Since the steps are detailed and specific, I'd recommend following the official guide on the Fairphone support forum to avoid any errors. This can resolve deep-seated system file issues causing the restarts.
