To diagnose why your Smart TV is disconnecting from your home network, please check the following:

1. Check your router settings:
   

   Make sure that your router’s firmware is up to date. Check that your router is using the correct settings for your IP address, DNS, and network connection type.

2. Check your network connection:
   

   Make sure that your ethernet cable is securely connected between your router and your Smart TV. Additionally, check if your wifi is stable and if your network connection is strong enough.

3. Check your TV settings:
   

   Verify that your Smart TV is connected to the correct network and that you are using the right network settings. Also make sure that your IP address and other network settings are correct and up to date.