Using Router With Styled Components OR HOCs causing unnecessary re-renders

### Version
Tell us which versions you are using:

- react-native-router-flux v4.0.6
- react v16.3.1
- react-native v0.55.4

### Expected behaviour
Provide Styles to my Router (navigationBarStyles, titleStyle etc... using Styled Components). I am using styled components v 4.1.2 to style my Router like so

`
const StyledRouter=styled(Router).attrs(props=>({
navigationBarStyle:{backgroundColor:props.theme.bgcolor},
...etc
})) `\`Tagged Literal stuff...\`

**My Main App Component**
`

{routes}

`

### Actual behaviour
All My Scenes Are being Unmounted and mounted continuously until I get an error and the app becomes completely non responsive and shuts off ( but the styling works perfectly).

Is it because styled is essentially an HOC, and is this causing re-renders? However, I have no problems using styled components in my other parts of the App.
**UPDATE**
I feel it is how the Router Component plays with HOCs, I tried it with withTheme HOC and I faced the same issue, for now the workaround is to use the global instance of my theme object and directly pass as props.