From what I can tell, the project's .NCB file becomes corrupt. Closing the project and deleting the .NCB and then reopening the project (which rebuilds the .NCB) usually will bring back the auto-complete feature. I have read other postings that indicate that the .NCB and .CLW both need to be deleted, but I personaaly have never run into a case where I had to delete the .CLW to get auto-complete bac