1. One thing to try is to delete the .suo file (usually at the Solution level) – after shutting down Visual Studio. Try restarting VS and see if you recover Intellisense.  The thing that fixed it for me was the following:  
2. Options pane under Text Editor/General (and also Text Editor / C#).

Make sure the Auto List Members and Parameter Information are CHECKED ( as shown below). That’s it- that should recover your intellisense.

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