Repeatedly losing XAML intellisense in Visual Studio 2010

Question

I'm using Visual Studio 2010 to edit XAML for Silverlight (4). On a daily, or even hourly basis I lose my XAML intellisense randomnly.

Often I'll get a whole page of valid XAML smothered in blue underlines from Visual Studio 2010's parser getting confused:

Here is one of the errors:

Error 6 The type initializer for 'Microsoft.Expression.Platform.Silverlight.Metadata.FrameworkElementMetadata' threw an exception. C:\projects...\Styles.xaml