如何强制Windows 10 uwp webview应用程序在暂停/恢复后加载URL并在超时时自动重新加载

This (simplified) c# / XAML UWP Webview app displays a blank page after the app is resumed after about 90+ sec. when displaying a local security cam video stream webpage. It appears to timeout after about 90 sec while the app is being suspended and then upon resuming the webview page is blank. To give the sample code below something to display, I randomly picked a site from a web search and landed on This (simplified) c# / XAML UWP Webview app dis