Hello, friend!
You can try the below steps:
1. check the Wi-Fi signal strength on your terminal. If the signal strength is weak, you may be far away from the signal source or an obstacle exists, and you are advised to get closer to the ONT;
2. get far away from Wi-Fi signal interference sources such as microwave ovens and cordless phones;
3. try the Wi-Fi connection on another terminal. If this problem does not occur, there may be a problem with the driver or hardware of your original terminal. Then you are advised to update the driver of the Wi-Fi network adapter and check whether the hardware is damaged.
4. change the Wi-Fi name (SSID). Duplicate SSIDs may exist within your terminal reach;
5. some viruses may exist and cause the disconnection. You are advised to test viruses by connecting only one computer and run antivirus software.
Thanks!