After multiple/quick dashboard reload top-bar and side-bar disappear

### Current Behavior

After multiple dashboard reload (F5 in web browser) top and side bar disappear and does not reappear until browser cache is cleared.

This is happening after upgrade from 1.4.1 to 1.8.1 . After reverting to 1.4.1 problem disappears.

### Expected Behavior

Fully functional dashboard

### Steps To Reproduce

1. Open Dashboard
2. Reload quickly few times

### Environment

- Dashboard version: 1.8.1
- Node-RED version: 3.1.3 - 3.1.9
- Node.js version: no idea, bundled with official NR docker image
- npm version: no idea, bundled with official NR docker image
- Platform/OS: Windows/ Mac
- Browser: Firefox, Chrome, safari

### Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate