OnePlus 3 Keeps Restarting? Fix All Problems
If your OnePlus 3 keeps restarting on its own, the fix usually involves clearing the cache partition, updating the software, or performing a factory reset—but the exact step depends on the underlying cause. This guide walks you through every practical fix for random reboots, boot loops, and shutdowns, from simple software tweaks to hardware-related checks.
Why the OnePlus 3 Restarts by Itself
The OnePlus 3, released in 2016, is an aging device that can develop random restart issues for several reasons. The most common causes are:
- Software bugs – outdated OxygenOS versions or corrupted system files can trigger crashes.
- Battery degradation – an old battery may fail to deliver stable voltage, causing sudden shutdowns.
- Overheating – heavy usage or a blocked cooling system can force the phone to reboot to protect itself.
- App conflicts – a poorly coded app or one that demands too many resources can crash the system.
- Hardware damage – a loose battery connector or a failing motherboard component can cause random resets.
Because the OnePlus 3 is no longer receiving major Android updates, some of these issues are more likely to appear over time. However, most restart problems can be resolved without replacing the phone.
Quick Fixes to Try First
Before diving into more invasive steps, try these simple solutions—they solve many restart issues in minutes.
- Force restart – Press and hold the power button for 10–15 seconds until the phone vibrates and reboots. This clears a temporary system hang.
- Remove the SIM and SD card – A faulty SIM or a corrupt SD card can cause system crashes. Power off, remove both, and restart without them.
- Charge with a different cable and adapter – A faulty charger can cause power fluctuations that trigger reboots. Use the original OnePlus Dash Charger if possible.
- Check for overheating – If the phone feels hot, let it cool down for 30 minutes before using it again. Remove any thick case that traps heat.
- Update all apps – Open the Play Store, tap your profile icon, then “Manage apps & device� and update everything. Outdated apps are a frequent cause of crashes.
Clear the Cache Partition
A corrupted cache partition is one of the most common reasons for random restarts on the OnePlus 3. Clearing it does not delete your personal data, so it’s a safe first step.
- Power off the phone completely.
- Press and hold the Volume Down button, then press and hold the Power button simultaneously.
- Release both buttons when the OnePlus logo appears. This opens the recovery menu.
- Use the Volume buttons to navigate and select “English� (or your preferred language).
- Select “Wipe data and cache� (this option does not erase your personal files; it only clears the cache).
- Choose “Wipe cache� and confirm.
- After the process finishes, select “Reboot�.
If the phone still restarts after this, the problem is likely deeper in the software or hardware.
Update or Reinstall OxygenOS
OnePlus released the last stable OxygenOS update for the OnePlus 3 in 2019 (Android 9 Pie). If you are on an older version, updating can fix known reboot bugs.
- Go to Settings → System → System updates and check for updates. If an update is available, download and install it.
- If you are already on the latest version, a clean install of OxygenOS may help. You can download the official ROM from OnePlus’s support website and flash it using the built-in recovery or a PC tool. This wipes all data, so back up first.
Note: Installing a custom ROM is also an option, but it requires unlocking the bootloader and voids the warranty. Stick to official software unless you are experienced.
Factory Reset – The Last Software Fix
If clearing the cache and updating did not help, a factory reset will erase all data and return the phone to its out-of-the-box state. This eliminates any software corruption that persists.
- Back up all important data (photos, contacts, files) to Google Drive or a computer.
- Go to Settings → System → Reset options → Erase all data (factory reset).
- Confirm and wait for the phone to reboot. The process takes about 5–10 minutes.
After the reset, do not restore from a full backup immediately—set up the phone as new and test it for a day. If the restarts stop, a backup app or setting was the culprit. If they continue, the problem is hardware-related.
Hardware Checks and Battery Replacement
If software fixes fail, the hardware is likely at fault. The OnePlus 3’s battery is user-replaceable (the back cover can be removed with a suction cup and plastic pry tools), but it’s not as easy as on older phones.
- Battery health – Over time, lithium-ion batteries lose capacity and can swell. A swollen battery can press against other components and cause random reboots. If the back cover is bulging or the battery is more than 3–4 years old, replace it.
- Battery connector – Open the phone and check that the battery connector is firmly seated. A loose connection causes power drops.
- Motherboard issues – If the phone restarts even with a new battery, the motherboard may have a failing component. Professional repair is needed, and it may cost more than the phone is worth.
Always power off the phone and disconnect the battery before any internal work. If you are not comfortable opening the device, take it to a reputable repair shop.
Frequently Asked Questions
Why does my OnePlus 3 restart when I open the camera?
The camera app is resource-intensive and can trigger a reboot if the battery is weak or the software is corrupted. Try clearing the camera app’s cache (Settings → Apps → Camera → Storage → Clear Cache). If that fails, a factory reset or battery replacement is the next step.
Can a faulty charger cause random restarts?
Yes. A non-certified charger or a damaged cable can deliver unstable voltage, causing the phone to shut down or reboot. Always use the original Dash Charger or a reputable third-party charger that supports VOOC/Dash fast charging.
Will a factory reset delete my photos?
Yes, a factory reset erases everything on the phone’s internal storage, including photos, videos, and files. Back them up to Google Photos or a computer beforehand. Photos stored on an SD card are not affected if you remove the card before resetting.
Is it worth repairing a OnePlus 3 in 2024?
It depends. A battery replacement costs around $20–$40 and can extend the phone’s life for basic use. However, if the motherboard is failing, repair costs can exceed the phone’s resale value (roughly $50–$100). Consider whether you need modern features like 5G or better cameras before spending money.
How do I enter recovery mode on OnePlus 3?
Power off the phone, then press and hold Volume Down and Power together for about 10 seconds. Release when the OnePlus logo appears. The recovery menu lets you clear the cache, wipe data, or flash updates.
Can a SIM card cause restart loops?
Yes, a damaged or incompatible SIM card can cause the phone to constantly search for a network, draining the battery and potentially triggering reboots. Remove the SIM and test the phone without it. If the issue stops, replace the SIM with your carrier.
When to Give Up and Replace the Phone
If you have tried all the above steps and the OnePlus 3 still restarts, the hardware is likely beyond economical repair. Signs that it’s time to upgrade include:
- Restarts happen even in safe mode (press and hold Power, then tap and hold “Power off� until the safe mode prompt appears).
- The phone heats up excessively even during light use.
- The battery drains rapidly or the phone shuts down at 20–30% battery.
In that case, consider a modern budget or mid-range phone, which will offer better performance, security updates, and battery life. The OnePlus 3 served its time, but no amount of troubleshooting can fix a dying motherboard.
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