Canon S200 on Last Legs?

I've taken approximately 11,000 (11,173 to be exact) pictures with my Canon PowerShot S200 Digital Elph, which I received for Christmas from my beloved father in 2002. Lately, though, I've been having some difficulties with the quality of photographs the S200 snaps. The autofocus has ceased to work on two occassions -- most recently when I was on vacation in Minnesota. Luckily, on both occassions this problem went away on its own but it makes me a bit worried, what if I am trying to capture a once in a lifetime moment and it turns out like this:

Which fortunately is just a picture of my Dad and not, say, an expose of Brad kissing Angelina... but you get the idea. For like a week, every picture I took with my S200 looked basically like this. Here's another one of my cousins and I at at my grandfather's house.

In some ways, I can understand why my camera would be a bit tired -- 11,173 is a lot of pictures. BEyond that it has survived two falls off a countertop onto the floor, being carried for 2 years in the front pocket of my backpack, camping trips, etc. Overall, it's been a wonderful camera - I can't really criticize it - definitely one of the best pieces of technology I've ever owned (robust, easy to use, and typically did exactly what I wanted when I wanted).