Filtering EHOSTDOWN, ETIMEDOUT and ECONNREFUSED. at least EHOSTDOWN.
I saw the previews issue I would suggest doing something like this below on line 110. Seems like all of this are related to the tv being of. I could create a pr if you let me know which option you prefer.

```
    this.lgtv.on('error', (error) => {
        if( ! error.contains( 'EHOSTDOWN' ) && ! error.contains( 'ETIMEDOUT' ) && ! error.contains( 'EHOSTDOWN' ) ){
                this.log.error('webOS - %s', error);
        }
    });
```
or
```
    this.lgtv.on('error', (error) => {
        if( string.indexOf( 'EHOSTDOWN' ) === -1 && string.indexOf( 'ETIMEDOUT' ) === -1 && string.indexOf( 'ECONNREFUSED' ) === -1 ){
                this.log.error('webOS - %s', error);
        }
    });
```


