There are various reasons which may cause the VPN to disconnect, eg: the network connection is poor or you have turned on power saving mode, it may result in auto disconnection.
Here are some possible causes why your VPN is disconnecting and its solutions:
1. Network Connection
Your network stability has a huge impact on your VPN connection. Please test your internet speeds without connecting to VPN and try to stream with the VPN disabled. If the speed is slow or the connection is still dropping, then you know that it’s your internet and not the VPN. You could change to another Internet Service Provider and reconnect.
2. Antivirus software or Firewall
Antivirus software or Firewall programs installed on your device may affect your VPN connection. These programs are always running in the background and can use up a lot of bandwidth.
To solve the disconnection issue, disable all Antivirus software or Firewall programs and reconnect.
3. Battery Optimization mode/Low Power Mode
Battery Optimization mode and Low Power mode reduce the amount of power that your device uses by disabling features and limiting the CPU usage of your device. While it helps to extend the battery life of your device, it might interrupt your VPN connection.
4. Kill Switch
Kill Switch will cut your internet connection when the connection is interrupted. This is great for security as it leaves no room for vulnerabilities. However, you might encounter disconnection because of this.
Connection Duration Boost
You can manage your battery or background settings easily via Connection Duration Boost in Android Device.