I've noticed a few times that my D90 misfires - that is, it seems to misfire, then you end up taking a picture of yourself staring into the lens wondering what the hell went wrong. I've had it in the shop where they replaced the contact points, or something. Today it happened again. This evening I thought that I'd try to find out under what circumstances it'd misfire. It turns out that it never (at least I haven't managed to get it to misfire so far, having fired of 75+ pictures) when it's in manual focus. This leads me to believe that it may be just a case of AF indecisiveness (busy, contrast-rich backgrounds etc). Does anyone have similar experiences?
Any input would be greatly appreciated.