Date and Time needing to have "unity-panel-service" reset to show again

[Wise Melon]

In the last few days (starting last week) my Date and Time panel in the top bar on the top-right hand side of it, keeps on disappearing as described here: http://askubuntu.com/questions/587445/no-date-and-time

And the "Date & Time > Clock" settings (as shown in the link above) keep on becoming greyed out when this happens.

To fix this all that needs to be done it for this command to be run in Terminal: sudo killall unity-panel-service

But this is only a temporary fix for the problem keeps on coming back, and this is now probably the third time that this has happened to me, and for no apparent reason, it just suddenly disappears when I am working on the computer.

System Information:

Description: Ubuntu 14.10
Release: 14.10

Package Information:

indicator-datetime:
  Installed: 13.10.0+14.10.20141009-0ubuntu1
  Candidate: 13.10.0+14.10.20141009-0ubuntu1
  Version table:
 *** 13.10.0+14.10.20141009-0ubuntu1 0
        500 http://gb.archive.ubuntu.com/ubuntu/ utopic/main amd64 Packages
        100 /var/lib/dpkg/status