If you have this error in the log, it probably means that your specific LG device doesn't hold the WiFi connection when turned off. A limited number of devices do that, there is no easy way to know which do and which don't. V2 devices should not have this issue, even when they drop the WiFi connection at idle time.
If you have one of those devices, please turn off "Log Connection Errors" in the plugin setup:
If you have one of those devices, please turn off "Log Connection Errors" in the plugin setup: