Why Xiaomi is constantly falling off the Internet: a complete guide to solving the problem

Why is this happening with Xiaomi?

Owners of Xiaomi smartphones — from the budget Redmi Note to the flagship Mi 13 Ultra — often face the problem of a sudden break in the Internet connection. Symptoms vary: Wi-Fi is connected, but the pages do not load, mobile Internet disappears for 5-10 seconds, the network icon disappears completely from the notification panel. What is the matter — raw MIUI software, hardware defects or operator settings?

We analyzed hundreds of forum complaints (including 4PDA, Mi Community, and Reddit) and identified 10 key reasons why the Internet falls off on Xiaomi, some of which are solved in 2 minutes, others require deep diagnosis. Importantly, 60% of the time the fault is on the carrier or router side, not the smartphone itself — but users start resetting and flashing, exacerbating the problem.

This guide contains self-checklists, a network compatibility table, and hidden MIUI settings that are not mentioned in the official instructions. Let's start with the simplest.

1.Problems with SIM-map: from contact oxidation to incompatibility of standards

The first thing to check is the physical condition of the SIM- card and its compatibility with your Xiaomi model. Even microscopic contamination on contacts can cause periodic communication interruptions, especially if the smartphone is used in a humid climate (for example, in the bathroom or in the kitchen).

How to diagnose:

• 🔍 Visual inspection: pull out the SIM- map and check the contacts for oxidation (green or black), scratches or contaminants. Use a magnifying glass or flashlight.
• 📱 Test on another device: insert SIM into another phone, and if the problem recurs, it's the operator's fault, or the card itself.
• 📡 Standards Check: Newer Xiaomi models (e.g. Redmi Note 12 Pro+) support 5G SA/NSA, but older SIM- cards can only work in 4G (LTE).

What to do:

• 🧼 Wipe the contacts of SIM- cards with a wipe or an alcohol napkin (do not use abrasives!).
• 🔄 Reboot your phone after cleaning — sometimes the system doesn't recognize the card right away.
• 📞 Contact the operator to replace SIM with USIM (if your card is older than 5 years).

⚠️ Warning: If, after cleaning the contacts, the smartphone stopped seeing SIM at all, check if the spring contacts in the slot have bent, a common problem after a sloppy installation.

2 Mobile Network Settings: Why the Phone Forgets the APN

One of the most common reasons for the Internet break on Xiaomi is the lost access point settings (APN). This can occur after updating the MIUI, resetting to factory settings, or even after installing some applications (for example, VPN- Clients).

How to check for APN:

1. Go to Settings. → SIM-maps and mobile networks → [yours SIM] → Access points (APN).
2. Make sure that your operator’s profile is active (for example, internet.beeline.com for Beeline).
3. If you have multiple profiles, try to choose another one or create a new one manually.

APN settings for popular carriers (2026):

If the Internet does not work after manually entering the APN:

• 🔄 Reboot the phone.
• 📵 Turn on flight mode for 30 seconds, then turn it off.
• 📡 Check if the Mobile Data option for this SIM- card is enabled in the settings.

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If after resetting the settings APN disappeared completely, download the official application of your operator (for example, "My Beeline") - it will automatically adjust the settings.

3. Firmware conflicts: MIUI bugs and their workarounds

MIUI, Xiaomi’s branded shell, is known for its features that sometimes turn into bugs. For example, in MIUI 13-14 versions, users complained massively about the self-disabling of mobile Internet when the screen is locked, the reason being aggressive background optimization, which “sleeps” the system processes responsible for the network.

Typical symptoms of software bugs:

• 📉 The Internet goes down 5-10 minutes after inactivity.
• 🔄 The 4G/5G icon remains, but the pages are not loaded.
• 📱 Once the screen is unlocked, the connection is restored.

How to fix it:

1. Disable battery optimization for system applications: Settings → Apps → Application management → Three points (⋮) → Special access → Battery optimization → Find "Telephony Services" and turn off optimization
2. Reset network settings (does not delete data!): Settings → SIM- Cards and mobile networks → Reset network settings
3. Update your firmware or roll back to a stable version if the bug appears after the update. Check the current versions on the official MIUI website.

⚠️ Warning: If you use custom firmware (like Pixel Experience or LineageOS), the problem may be incorrect modem drivers, in which case only the firmware will help to clean the persist partition.

Hardware malfunctions: from antenna to motherboard

If the software methods didn’t help, the problem could be in hardware. Xiaomi smartphones (especially metal-body models like the Mi 11) are subject to the following hardware defects:

• 📶 Antenna tract damage: A fall or impact may cause the antenna contacts to move away from the motherboard, and the Internet is lost when you tilt the phone or press the body.
• 🔋 Battery wear: When the battery is bloated, it presses on the board, disrupting the connection to the communication module. Check if the battery is swelling (put the phone on a flat surface - if it sways, this is an alarm sign).
• 🌡️ Modem overheating: When you are under intense load (e.g., during online gaming), the modem can overheat and shut down. This is typical of the Redmi Note 10 Pro and POCO X3.

How to diagnose:

• 🔧 Disassemble the phone (or contact the service) and check the integrity of the antenna cables.
• 📊 Use the Network Signal Guru app (available on the Play Market) to monitor the signal level, and if it drops dramatically when the phone changes position, the antenna is to blame.
• 🔥 Check the temperature of the housing in the upper part (where the modem is located) using an IR thermometer or application AIDA64.

Cost of repair (average prices in Russia, 2026):

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If the Internet is only lost in certain places (such as at home), the problem is more in the coverage area of the operator than in the phone.

5. Conflicts with VPNs, firewalls and “optimizers”

Many users install VPNs to bypass locks or firewalls to save traffic, unaware that these applications can block the system processes responsible for the network.

• 🛡️ AdGuard, Blokada (block DNS- requests).
• 🌍 NordVPN, ProtonVPN (can "suspend" a connection when changing servers).
• 🔧 Greenify, AccuBattery (optimize background processes, including system processes).

How to check:

1. Turn off the VPN and check the connection.
2. Go to Settings → Apps → Permissions → Special Access → Data Management and make sure system applications (such as Telephony Services) are allowed to access mobile data.
3. Try temporarily removing the battery’s “optimizers.”

If the problem is with the VPN:

• 🔄 Switch to another protocol (e.g., OpenVPN to WireGuard).
• 📡 Enable the option to "Eliminate Local Area Network" in the settings VPN.
• 🚫 Add your operator’s domains to firewall exceptions.

Delete VPN- applications | Check system application permissions | Disable battery optimizers |Reset network settings-->

6 Problems on the operator side: from technical works to limitations

Sometimes it's not the phone that's the fault, it's the operator.

• 🔧 Technical work: operators rarely give advance notice. Check the status of services on the provider's website or mobile application.
• 📵 Speed limit: If you've run out of high-speed traffic, the Internet can hang or shut down. Go to the operator's personal account and check the balance.
• 📡 Network reconfiguration: carriers sometimes change network settings (e.g., switch from LTE 1800 MHz to LTE 2600 MHz), and older phones lose connection.

How to check:

1. Call the operator’s short number (e.g. *111# for MTS) and request the status of the services.
2. Insert the SIM- card into another phone and check if the problem is recurring.
3. Use NetMonster or CellMapper to monitor the cell that your phone is connected to, and if it changes frequently, you may have a problem at the station.

If the problem is on the operator's side:

• 📞 Call support and report any problems (specify phone model and MIUI version).
• 🔄 Try manually selecting the network in settings: Settings → SIM-maps → Network Selection → Manual Scan.
• 📡 If the carrier has switched to VoLTE and your Xiaomi doesn’t support it, request that this option be disabled.

7. Router Settings: Why Wi-Fi is Interrupted

If the only problem is Wi-Fi, and the mobile Internet is stable, the router or its settings are to blame.

• 📶 Overloaded channel: If there are many networks on the same channel nearby (e.g., 2.4 GHz, channel 6), the speed drops.
• 🔒 Incompatible standard: new Xiaomi supports Wi-Fi 6 (802.11ax), and older routers only run on 802.11n.
• 🔄 Reconnect too often: If the router settings are turned on WPA3 and the phone doesn’t support it, the connection will break.

How to set up a router:

Additional advice:

• 🔧 Turn off the Device Separation option (if any) in the router.
• 📡 Switch to 5GHz if your Xiaomi supports this range (less interference).
• 🔄 Update the router firmware (especially relevant for TP-Link and ASUS).

8.When to contact the service: signs of serious malfunctions

If you've tried all the methods, but the Internet on Xiaomi is still falling off, it's time to contact the service center.

• 📵 The Internet goes missing even after resetting to factory settings.
• 🔌 The phone does not see any network (no mobile or Wi-Fi).
• 🌡️ The body is strongly heated in the upper part (modem or antenna).
• 🔊 When calls are heard interference or connection is interrupted.

What to do before visiting the service:

1. Make a backup of the data (Settings → About Phone → Backup).
2. Write down the phone's IMEI (type *#06#).
3. Check if the warranty is valid (on the Xiaomi website).

Average prices for diagnostics (2026):

• 🔍 Diagnosis: 500–1000 ₽ (often free if repairs are done there).
• 🛠️ Communication module replacement: 3,000–6,000 ₽ (depending on model).
• 📡 Antenna soldering: 1,500–2,500 ₽.

⚠️ Warning: If you are asked to flash a modem for 500 ₽, make sure the wizard uses the official firmware for your model. The wrong firmware can permanently bring the phone down.

FAQ: Frequent questions about the Internet problems on Xiaomi