My client is experiencing a bug that I cannot reproduce. Yet he can! He is unavailable for a week so I can't get any more info.
The logs show that a request was received server-side and a response sent, but the client didn't receive a response. There was no time out error and refreshing the request (refresh button) failed to spin the activity indicator (in status bar), like it usually does.
After 5 minutes, the client would not send a fresh request. I think it is a threading issue.