The situation when a popular ad blocker AdGuard suddenly stops working on a smartphone is familiar to many users Android. You install the application, set up filters, but after a few hours you notice that the protection is disabled and intrusive banners appear in the browser again. This is not a malfunction of the software itself, but a consequence of aggressive optimization of operating system resources.

Modern versions Android are designed to save battery power and RAM as much as possible. To do this, the system automatically “kills” background processes that, in its opinion, consume too much energy or have not been used for a long time. Since AdGuard works as a local VPN service or proxy, it is constantly active in the background, which is often perceived by the system as an extra load.

The solution to the problem lies in correctly setting permissions and exceptions for a specific application. You don't need to be a programming expert to fix this. It is enough to go through certain points in the settings of your device and give the system a clear signal that this process is important and cannot be terminated forcibly.

Aggressive optimization of battery and background processes

The main enemy of stable operation of the blocker is the built-in energy saving mechanisms. Smartphone manufacturers (Xiaomi, Samsung, Huawei and others) often add their own shells on top of the pure one. These shells have extremely strict power management algorithms. Android. These shells have extremely strict power management algorithms.

When your device's screen goes dark, the system goes into deep sleep mode. At this moment, it begins to analyze running applications. If AdGuard is not included in the exception list, the system considers it a background process that can be safely stopped to save battery. As a result, the ad blocking service simply “falls asleep” along with the phone.

⚠️ Attention: On some smartphone models, especially those with MIUI or EMUI shell, standard energy saving settings may ignore user preferences. If you notice that the application crashes immediately after locking the screen, the problem is in this mechanism.

To understand how much your system limits background activity, it is worth checking your battery usage statistics. Often there you can see a record that the application has been limited or closed by the system to save energy. This is a direct indicator that battery optimization works against your interests.

📊 How often does AdGuard turn off?
Constantly, every few hours
Sometimes, once every day
Only after reboot
Never turns off

Setting exceptions in the “Battery” section

The first and most important step is to remove restrictions on energy consumption for a specific application. The settings interface may differ depending on the version Android and phone model, but the logic of action remains the same.

You need to find the section responsible for managing the power of applications. It is usually located in the general system settings or in the special “Battery” menu. Here you need to change your job profile AdGuard from “Optimized” to “No restrictions” or “Do not limit.”

  • 🔋 Go to Settings your smartphone.
  • ⚙️ Find the section Applications or Battery.
  • 🛡️ Select AdGuard from the list of installed apps.
  • 🚫 Find the item Battery saving or Battery optimization.
  • ✅ Set the value No restrictions.

After performing these actions, the system will receive a command not to interfere with the operation of the blocker, even if the device is located in standby mode for a long time. This is critical to maintaining a constant connection through the local VPN interface.

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If you cannot find the “Battery Saver” item in the application settings, try searching through the phone settings by entering the word “battery” or the name of the application itself.

Allowing auto-start and work in the background

In addition to the restrictions on power supply, many Android shells block the ability of applications to launch on their own after rebooting the device or minimizing it. If AdGuard does not have the right to autostart, he will not be able to activate the protection immediately after turning on the phone.

Particular attention should be paid to users of Xiaomi and Huaweidevices. Their firmware has a separate permission manager that controls the start of applications. Even if you have given all permissions inside Android itself, this manager can block start.

You need to go to the “Security” or “Phone Manager” application, which is preinstalled on the device. There you should find the “Permissions” section and make sure that the “Autorun” item is activated for the ad blocker. Without this step, you will have to launch the application manually after each reboot.

Smartphone brand Path to configure autorun Section name
Xiaomi / Redmi Security -> Permissions -> Autorun Autostart
Huawei / Honor Phone manager -> Launch applications Launch control
Samsung Settings -> Applications -> Sleep mode Applications in deep sleep
OnePlus / OPPO Settings -> Battery -> Background activity Allow background activity

Make sure the switch opposite AdGuard is active in all available launch control menus. This ensures that the protection service will be initialized by the system immediately after loading the Android kernel.

☑️ Check autorun permissions

Done: 0 / 4

Features of the local VPN service

Technically AdGuard creates a local VPN tunnel on your device. All traffic passes through this virtual interface, where it is filtered according to the selected rules. Android allows only one VPN connection to be active at a time.

If you try to enable another VPN service (for example, to change geolocation or corporate network), the system will automatically disable AdGuard. This is standard operating system behavior and cannot be bypassed without root access or using proxy mode (which is less reliable).

In addition, some antiviruses or built-in protection tools (for example, Google Play Protect) may mistakenly classify the creation of a local VPN as suspicious activity. In rare cases, this leads to a forced stop of the service.

⚠️ Attention: If you use a third-party VPN to bypass blocks, AdGuard will not work. You will have to choose one or the other or configure traffic routing through a proxy server within AdGuard itself, if such a function is supported by your version.

It is also worth remembering that when updating security certificates or changing network settings, Android may break the VPN connection. In this case, the application will usually try to reconnect automatically, but if it is “killed” by the system, this will not happen.

Why can’t you use two VPNs at the same time?

The Android architecture provides only one active virtual private network interface. An attempt to activate the second service leads to an immediate termination of the first connection at the system kernel level.

Conflicts with other applications and memory clearing

So-called memory cleaners and phone boosters are a common reason for disabling the blocker. Applications like Clean Master or built-in optimization tools often see AdGuard a process consuming RAM and forcefully terminate it to “free up resources.”

This creates a vicious circle: you configure the system, but third-party software resets your settings every few hours. You need to add the ad blocker to the white list of all installed cleaning and optimization utilities.

Also check if you have other ad blocking applications installed that may conflict with each other. The simultaneous operation of several filtering services can lead to network instability and the collapse of one of them.

  • 🗑️ Open all installed cleaner applications.
  • 📝 Find the section Exceptions or White list.
  • 🛡️Add AdGuard to the list of protected applications.
  • 🚫 Turn off the "Automatic memory cleaning" feature in the background.

If you use Do Not Disturb mode or energy saving profiles, check if they are disabling network connections for background applications. In super-saving mode, the battery can turn off the mobile data for all apps except dialers and instant messengers.

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Third-party optimization apps are often the main reason for the unstable operation of system services. Adding AdGuard to the exclusions of such apps is mandatory.

Checking notifications and persistent connections

Modern versions of Android (starting from 8.0 and higher) have strict requirements for background services. For an app to run legally in the background, it must display a persistent notification in the curtain bar. This is a signal to the system that the process is important to the user.

If you accidentally disable AdGuard notifications, the system may consider it an “invisible” background process and terminate its operation. Make sure the notification channel for the security service is active and not hidden.

Go to the notification settings for the application and make sure the Allow notifications switch is turned on. It is also important that the notification about the operation of the protection itself is not disabled within the settings of the application itself AdGuard.

Settings → Applications → AdGuard → Notifications → Enable

The presence of an icon in the status bar not only informs you about the protection status, but also increases the priority of the process in the eyes of the operating system task scheduler. This is a simple but effective way to prevent accidental termination of the service.

Diagnostics and collection of logs during failures

If all settings are checked, but the problem persists, there may be a software conflict or an error in a specific firmware version. In this case, you need to use the diagnostic tools built into the application itself.

AdGuard has the function of maintaining detailed logs (logs). By enabling advanced logging, you can track the moment when a service stops and see the reason for the failure. This could be a certificate error, a network failure, or a signal from the system about low memory.

To enable logging, go to the application settings, select the “Advanced” or “Diagnostics” section and activate logging. After reproducing the problem (when the application shuts down), save the log file and analyze the latest entries before stopping.

⚠️ Warning: Advanced logging consumes more CPU and battery resources. Do not keep this function enabled all the time; use it only to diagnose specific failures.

You can often find messages in the logs that the system has revoked permission to create a VPN or that the network interface has become unavailable. This information will help you understand whether the problem is internal (application error) or external (Android system actions).

Where are AdGuard logs stored?

By default, log files are saved in the device’s internal memory in the /AdGuard/logs folder. You can access them through any file manager.

Frequently asked questions (FAQ)

Why does AdGuard turn off immediately after rebooting the phone?

Most likely, the application does not have permission to autostart. Check your settings in your phone manager or application permissions and allow auto-start for AdGuard. Also make sure that it is not in the “Deep Sleep” list.

Can AdGuard be used together with another VPN?

No, the standard mode of AdGuard operation uses the VPN interface. Android only supports one active VPN connection. If you need to use both services, try setting up AdGuard in local HTTP proxy mode, but this will require manually setting up a proxy on Wi-Fi networks.

Does AdGuard affect Internet speed?

Minimal impact is possible due to the need to filter traffic in real time. However, on modern devices with fast processors, this speed reduction is almost unnoticeable. More often, the speed drops due to a poor network signal, rather than the work of the blocker.

What to do if the key icon (VPN) disappears from the status bar?

This means that the protection service is inactive. Check to see if you have turned off notifications for the app. If notifications are disabled, the system may hide the icon and stop the service. Allow notifications in the Android settings.