Live Update Missing Updates

I have a client who was unable to run a Full Scan (manually).  I logged in and immediately ran Live Updates. To my surprise,  had to run it twice to get all the updates.    Additionally, there was a patch that needed to applied.  For the record, the Full Scan ran fine after the update. 

I pulled the logs and Live Update had run automatically at 9:07 that same morning (my manual updates were at 14:16 and 14:23).  I want to understand WHY these later updates did not run automatically. I have attached the log file (txt and pdf). 

My main issue is that I have been telling my clients that they need to do nothing to assure that they are fully protected.  I opened a case with the support team [Removed Case ID] and the tech told me that I need to have my clients manually run Live Updates daily or so.  If this is truly the case, I may need to leave the Symantec family because this is not what is expected or wanted.

This occurred with NIS.  I was also told that the OS and product version will affect this behavior.  This pc is on Win8.1 and I have a pc on Win8.1 and it never missed an update.  My pc is on SEP small business.  My other pc is on Win7 with NIS and it had no issue as well. 

I appreciate any enlightenment. 

[Admin Edit: Masking case ID to conform with the Participation Guidelines and Terms of Service]