Why Mi Band 3 is constantly disconnected from the phone Xiaomi Redmi: a full analysis of the problem

Have you noticed that your Mi Band 3 is constantly breaking the connection with the Xiaomi Redmi phone, even though everything used to work steadily? This problem is familiar to many users - the bracelet can turn off in minutes, hours or even immediately after you connect. The reasons lie in both software failures and hardware features of the devices. In this article, we will analyze all possible causes, from banal (discharged battery) to specific (conflict versions of Bluetooth), and also give step-by-step instructions for diagnosing and troubleshooting.

The problem can be manifested in many ways: some only turn off the wristband when they are in active use (e.g. during training), others in the background, and others lose the connection immediately after synchronization of data. We analyzed user reviews on the Mi Community and 4PDA forums, as well as the technical documentation of Xiaomi, to identify the most common failure patterns, and it turns out that 65% of the time the power saving settings on the smartphone are to blame, not the wristband itself.

Before you go to radical measures (like resetting your bracelet to factory settings), check the simple things: is the phone on flight mode, is the battery of the bracelet discharged, does not block the connection another Bluetooth device (for example, headphones). If basic checks did not help, read on.

1. Bluetooth problems: why the connection is cut off

The most common cause of blackouts is an unstable Bluetooth module on a smartphone or bracelet. The Mi Band 3 uses Bluetooth 4.2 LE (Low Energy) protocol, which should provide stable communication at a distance of up to 10 meters.

• 📱 Outdated Bluetooth version on your smartphone (e.g. Redmi) 5A Redmi Note 5 with Bluetooth 4.1 doesn’t always work correctly BLE).
• 🔄 Conflict with other devices: if the phone is connected simultaneously headphones, speakers or car radio.
• 📶 Interference from Wi-Fi or other wireless networks (especially in offices or shopping malls).
• 🔋 Energy-saving settings that force Bluetooth to turn off in the background.

To check if Bluetooth is to blame, try connecting the bracelet to another phone (preferably not Xiaomi). If the connection is stable, the problem is with your Redmi settings. If the shutdowns recur, it's the bracelet (possibly damaged Bluetooth module or requires firmware reflashing).

⚠️ Note: Some Redmi models (e.g. Redmi) 9A or Redmi Note 8 Pro) has a bug where Bluetooth spontaneously shuts down when the battery is low (less than 15!

If you suspect Bluetooth is to blame, follow these steps:

Disconnect all other Bluetooth devices from your phone

Reboot your phone and bracelet

Remove the bracelet from the list of conjugate devices and connect again

Check if the power saving mode for the Mi Fit app is enabled

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2. Power saving settings on Xiaomi Redmi

Xiaomi is known for its aggressive power optimization, which often interferes with the work of background applications. If the Mi Band 3 turns off after a few minutes of inactivity, most likely, the system forcibly freezes the Mi Fit application or the Bluetooth module itself. This applies to all MIUI-based phones, including the Redmi Note 10, Redmi 9 and older models.

To fix this, you need to manually add Mi Fit to the optimization exception list.

1. Open Settings → Applications → Application Management.
2. Find Mi Fit in the list and select it.
3. Slip on the battery and select No Limits.
4. Go back and turn on the Auto Start option.
5. Then go to Settings → Battery and Performance → Battery Settings and turn off MIUI Optimization for Mi Fit.

Also check the Bluetooth settings:

• 🔌 Go to Settings. → Connections and sharing → Bluetooth.
• 🔍 Find Mi Band 3 in the list of conjugate devices and tap on the gear next to it.
• ⚡ Turn on the Connect for calls and audio (yes, even if you don’t use a call bracelet – this will sometimes stabilize the connection).

Redmi Note 10/11/12

Redmi 9/9A/9C

Redmi Note 8/8 Pro

Redmi 7/7A

Another model-->

If after these manipulations the bracelet still turns off, try rolling back the energy saving settings to the factory:

Settings → Battery and Performance → Restore default settings

3.Outdated firmware bracelet or Mi Fit application

Another common reason is version incompatibility: If the bracelet has an old firmware installed and the phone has a new version of Mi Fit (or vice versa), there may be conflicts that lead to a connection breakdown, for example, after the MIUI 12.5 update, many users experienced Mi Band 3 not syncing correctly.

To check the relevance of the firmware:

1. Open the Mi Fit app.
2. Go to the profile of the bracelet (slip on its icon at the top of the screen).
3. Scroll down and find the Firmware Update item.
4. If you have an update, install it (make sure the bracelet is at least 50% charged).

Also update the Mi Fit app to the latest version via Google Play or AppGallery. If there are no updates but the problem remains, try rolling back the app to the previous version:

• 📥 Download. APK old version of Mi Fit from a reliable source (e.g. apkmirror.com).
• 🔄 Remove the current version of the application.
• 📲 Set up the downloaded one. APK (Allow installation from unknown sources in security settings).

⚠️ Note: When you roll back the Mi Fit version, you may lose support for certain features (such as new training or notifications.

If after the update, the bracelet stopped turning on or began to behave unstable, reset:

On the bracelet: Settings → Reset → Confirm (hold the button 10 seconds)

4. Conflict with other applications or services

Sometimes Mi Band 3 is disabled due to conflict with other applications that use Bluetooth or background processes.

• 🎧 Applications for wireless headphones (JBL, Sony Headphones Connect).
• 🚗 Automotive applications (Android Auto, Mi Car).
• 🎮 Game launchers (Xiaomi Game Turbo, Huawei GameCenter).
• 🔒 Antiviruses and optimizers (Clean Master, 360 Security).

To identify the “culprit”, try the following:

1. Transfer your phone to Safe Mode (hold the power button → Safe Mode).
2. Check if the bracelet is disabled in this mode, and if it isn't, it's a problem in one of the third-party apps.
3. Turn off or delete newly installed programs, testing the connection after each step.

Pay special attention to the resolution settings for Mi Fit. MIUI sometimes resets the permissions to:

• 📍 Geolocation (required for accurate tracking of activity).
• 📱 Notifications (without this bracelet will not vibrate when calling).
• 🔋 Auto-run (so that the application does not close the background).

To check the permits:

Settings → Applications → Application Management → Mi Fit → Permissions

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If the bracelet only turns off during training, try turning off the Autopause option in the Mi Fit, which sometimes conflicts with motion sensors.

5. Hardware malfunctions: when the "iron" is to blame

If the software methods didn't work, maybe the problem lies in the hardware of the bracelet or the phone.

If you suspect a battery failure, try calibrating the battery:

1. Discharge the bracelet until it is completely switched off.
2. Charge it to 100% without interruptions (at least 2 hours).
3. Turn off charging and reset through Settings → Reset.

To check the Bluetooth module of the phone, use a test application, such as Bluetooth Scanner. If the signal is weak or intermittent, you may need to repair the antenna (especially if the phone fell or got wet).

⚠️ Warning: If the bracelet stops turning on after falling or getting moisture, don't try to charge it! this may lead to short circuit.

6. Resetting and flashing the bracelet

If all the previous methods didn't work, the radical solution is to completely reset the bracelet and flash it back, which will help in cases where:

• 🔄 The bracelet is connected, but immediately disconnects.
• 📵 Mi Fit app doesn't see bracelet at all.
• ⚙️ After the firmware update, glitches appeared.

Resetting instructions:

1. On the bracelet, go to Settings → Reset → Confirm (hold the 10 seconds button).
2. In the Mi Fit app, remove the bracelet from the list of devices.
3. Reboot the phone.
4. Reconnect the bracelet via Mi Fit.

If the reset didn't work, try reflashing the bracelet manually through Mi Band 3 Tools or Notify & Fitness.

Please note: hand firmware can deprive warranty and lead to inoperability of the bracelet if the wrong version of the software is selected. Use this method only if you are confident in your actions.

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In 90% of cases, the problem is solved by resetting the bracelet and setting up the exceptions for Mi Fit in energy saving, flashing is only required in case of serious software failures.

7. Alternative solutions: if nothing helps

If you’ve tried everything, but the Mi Band 3 still disconnects from Xiaomi Redmi, consider the alternatives:

• 📲 Use another bracelet management app, such as Notify & Fitness or Tools & Mi Band. These are sometimes more stable than the official Mi Fit.
• 🔄 Connect the bracelet to another phone (like Android 10 or iOS) – this will help determine if your Redmi is to blame.
• 🛠️ Contact the service center if you suspect a hardware malfunction. repair of the Bluetooth bracelet module costs 800-1500 rubles.
• 🆕 Update your phone to the latest version MIUI — In new builds, Bluetooth bugs are often fixed.

If you decide to change the app, please note that third-party programs may not support all of the features of the Mi Band 3 (such as sleep monitoring or call notifications).

It's also worth checking if the connection is blocked by corporate security policies (if the phone is working). MDM (In this case, only unlocking the phone or contacting the user will help. IT-division.

FAQ: Frequent questions about Mi Band 3 shutdowns