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What to do if the network lags, APP delays, or web pages fail to load while using the Xiaomi Router BE3600?

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What to do if the network lags, APP delays, or web pages fail to load while using the Xiaomi Router BE3600?

First, please disable the IPv6 option and then perform standard troubleshooting.
To disable the IPv6 option, please refer to the following methods:
Method 1:
Using the Mi Home/Xiaomi Home APP: Go to the router’s page in the APP >> tap [Network settings] >> [IPv6 network settings] >> disable it.
Method 2: 
Using the web interface: On a mobile device or PC, open a browser and enter 192.168.31.1. Enter the management password >> click [Common settings] >> [Network settings] >> scroll down to find [IPv6 network settings] and disable it.
You can also try the following troubleshooting steps to identify and resolve the issue:
1. Reboot both your modem and router or use a wired connection to check if your Internet connection is stable;
2. Reduce the connected devices to decrease the load of the network;
3. Change the Wi-Fi channel or band to reduce the wireless interference. Switch between 2.4GHz and 5GHz bands;
4. Ensure that the router's firmware is up to date. You can check for updates via the Mi Home/Xiaomi Home APP or the web backend interface;
5. If only certain applications or web pages are slow, try clearing the APP or browser cache, restarting it, or reinstalling the APP to ensure it's not causing the lag;
6. Perform a factory reset if necessary. Remember to back up your settings if needed;
7. Please contact your Internet service provider to ensure there are no outages or issues on their end.