Why does Google Drive for Android say "Failed to open the document"? Periodically, when I try to use Google Drive for Android, it will show the list of documents, and when I click one, it says:

"Failed to open the document. / Unable to open the document. Please make sure you are connected to the Internet and have permission to open the document and try again. / Cancel / Open in browser"

I had the problem Tuesday and couldn't open any documents; by Wednesday it was normal again; today it's back and I can't open any documents.  The app is the newest version and has not released any upgrades in the meantime, so I'm thinking it may be caused by the server. Is that plausible?  Is there a fix?

I am using Cyanogenmod 10 (Android 4.1.2) on a Samsung Captivate.

[More info:  When I choose "Open in browser" it does open in the browser.  But it still doesn't open in the Google Drive app.]
After months of mysery, I found the solution: go to docs app (instead of the drive app): if it says you need an update you are lucky as this solved my problem.