Owners of Xiaomi, Redmi and Poco devices often face the unpleasant situation of a stable Internet connection suddenly disappearing.The screen of the smartphone may show the connection icon, but the pages in the browser stop loading and the applications write about the lack of a network. This phenomenon is especially annoying during video calls or online games, when every millisecond is important.
The problem can be either software failures in the MIUI shell or HyperOS, or router settings that are incorrect. Sometimes it's the hardware of the smartphone itself or the signal interference, and understanding the nature of the communication break is the first step to restoring the wireless module to stable operation.
In this article, we will discuss the main reasons why Wi-Fi on Xiaomi phone breaks down, and offer step-by-step solutions, you will learn which settings to change first and how to diagnose a malfunction without resorting to the services of a service center.
The main causes of unstable connection
The first thing that comes to mind when you lose a signal is a weak router. However, in the Xiaomi ecosystem, there are often conflicts of software algorithms for energy saving, the system tries to save battery power and forcibly turns off the Wi-Fi module if it believes that the user is inactive or the signal is too weak for energy consumption.
Another common cause is network cache overflows: The operating system accumulates temporary files that eventually start to conflict with new connections, which causes the phone to "forget" as a properly-authenticate with the access point, and simply resets the connection.
⚠️ Note: If Wi-Fi only breaks down in specific games or instant messengers, the problem may not be in the phone, but in the congestion of the application servers or locks on the part of the provider.
Also worth considering is the physical distance and the presence of obstacles. The 5GHz frequency signal, which is often used for high speeds, has less penetrating power. Thick walls or metal structures between the router and the Redmi Note smartphone can cause regular tears.
Energy saving settings and background processes
MIUI is known for its aggressive memory and energy management policy, and MIUI Optimization can mistakenly identify network processes as undesirable and terminate them, especially for older models such as the Xiaomi Mi 9 or Redmi Note 8.
To check if energy saving is causing the breaks, you need to go to the battery settings, and here you can find a list of applications and background processes. If you see that the system restricts Google Play services or Android system components, this is a direct path to unstable Wi-Fi.
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Try turning off the power saving mode for a while and check the connection stability, and if the breaks stop, then the problem is the algorithms for saving the charge.
In some cases, changing Wi-Fi sleep mode helps. By default, the phone can go into sleep mode when the screen is off, which causes a connection to break, and you need to configure the device so that Wi-Fi is constantly working.
- 🔋 Go to Settings. → Battery and select Performance mode to check.
- 📱 In the Apps menu, find Security and remove background activity restrictions.
- ⚙️ In advanced battery settings, turn off Sleep Mode for system services.
Diagnostics of frequency bands and channels
Modern routers operate in two bands: 2.4 GHz and 5 GHz. The 2.4 GHz band is more polluted by signals from neighbouring routers, microwave ovens and Bluetooth devices. If your Xiaomi is connected to an overloaded channel, stability is not expected.
The ideal solution is to switch to 5 GHz if the router and phone support this standard. However, if you are far from the signal source, the phone can constantly try to switch between frequencies, causing micro-gaps, in which case it is better to lock the connection on the same frequency.
You can use special applications to analyze the congestion of channels, but often just reboot the router, it will automatically select the least loaded channel at start. If this does not help, you should manually change the channel in the router settings to 1, 6 or 11 for a frequency of 2.4 GHz.
| Parameter | 2.4 GHz | 5 GHz |
|---|---|---|
| Signal range | Tall. | Low. |
| penetrating ability | Good. | Bad. |
| Transmission speed | Up to 150-300 Mbps | Up to 1 Gbps and up |
| Impact of interference | High. | Low. |
Resetting network settings and DNS
If a software failure has already occurred, simple reboots may not help, in which case resetting network settings, which will delete all stored Wi-Fi passwords, Bluetooth and mobile network settings, returning them to factory values.
To do this, go to the phone's settings menu. The path usually looks like: Settings → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth. Once confirmed, the phone will restart and you will need to re-enter your network password.
☑️ Checklist before network reset
Another important aspect — DNS-servers. Providers often provide their own DNS, Replacing them with public servers from Google or Cloudflare often solves the problem of long responses and cliffs.
To prescribe a static DNS, click on your network name in the Wi-Fi list, select "Setting up IP" and turn it to "Static." In DNS 1 and DNS 2, enter 8.8.8 and 1.1.1.1 addresses, respectively.
Firmware updates and system errors
Xiaomi regularly releases security updates and bug fixes. If your device has an older version of MIUI installed, it may contain known Wi-Fi module errors. Check for updates in the About Phone section.
But the opposite is true: after a fresh update, Wi-Fi starts to work worse, which indicates the rawness of the new firmware, in which users often wait for the next patch or roll back to the previous version via Recovery mode.
⚠️ Warning: Before updating or rolling back firmware, be sure to make a full backup of the data, as the process may result in their loss.
How do you roll back the MIUI version?
It's also worth checking if you have custom themes or modified system fonts installed. Sometimes poorly assembled themes can affect system services, including network modules. Try to return a standard theme.
Hardware problems and antenna module
If the software methods didn't work, it might be the hardware. The antenna module in Xiaomi smartphones is a thin plume that can move away from the board when it falls. Even microscopic disruption of contact leads to periodic signal loss.
Another hidden cause is overheating of the processor or Wi-Fi module. During prolonged load (for example, downloading large files or a navigator), the chip can warm up, and the system forcibly reduces the transmission power or disables the module for protection.
Visually inspect the phone case. If there have been falls or moisture, the probability of hardware failure is high. In such cases, self-repair without soldering skills and multimeter diagnostics is not recommended.
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If the reset to factory settings did not eliminate the problem, and on other devices Wi-Fi works stably - most likely, the smartphone antenna module is faulty.
You can use an engineering menu to diagnose this, and if you type ##6484## in your dialer, you'll be taken to the CIT menu, and you can run a Wi-Fi test that shows real-time speed and stability.