Why does my Smart TV keep switching input sources on its own?

1. Check if your remote control has a source button and if it accidentally gets pressed.
2. Check if the source button of the TV itself has been pressed.
3. Turn off any Quick Start or Quick View options as they may be automatically switching between input sources.
4. Check any connected devices and ran GeForce Experience to scan your PC for connected devices to see if it may be changing the input source based on a device connection.
5. Check any connected devices for CEC settings which may be changing the input source.