"Disk was not ejected properly" error shows up everytime I wake up my imac... started a days back

This started a few days back when I updated my Mac OS X. Not sure it's related but that's when this issues started. I can see it's due to my external HD (seagate go flex 1.5T, TB connected) from the log file but not sure why this is happening all of a sudden.
Any way I can fix this issue? I properly ejected and re-connected the drive but the problem still persiste. I set up my iMac to go to sleep after one hour of inactiveness by the way.
Appreciate any tips for this.
Yoon

Try running the combo updater. It fixed a lot of problems for people when 10.8.4 was released.
10.8.5 Combo Update
Based on other discussions, this seems to be a 10.8.5 bug. Send Apple feedback. They won't answer, but at least will know there is a problem. If enough people send feedback, it may get the problem solved sooner.
Feedback
Or you can use your Apple ID to register with this site and go the Apple BugReporter. Supposedly you will get an answer if you submit feedback.
Feedback via Apple Developer

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