Any S3IS Users Here???

(or S5IS). I joined this group because I love Canon products. I own an S3IS, and have had a few issues with it that I'd like to discuss with someone here who may know how to remedy it. For instance, I can't seem to get a very sharp clear image. It's like the auto-focus just wants to do it's own thing regardless of what I want or am aiming at. Anyone else have this happen, and what have you done about it?

And that concludes my attempt at jump-starting this here group! lol!