Originally posted by Ash My response follows your verbatim post in the More SDM failures thread.
It's not necessarily 'about to fail' but it is perhaps more a shortcoming of SDM's ability to accurately lock focus.
If you read though the list of SDM posts, I posted in that thread, there are a few that post that the lens not locking focus was a first symptom. Unfortunately reading them as jumbled the accounts in my mind so I can't simply point to the posts that do mention this. It could also have even been in reading the threads of those post that I saw this. Gees, I sound like a Global Warming scientist talking about their data. ;-)
My point is, if it is under warranty, send it in as quick as possible.
Thank you
Russell