I'm going to have to switch it to "manual focus", which is not as crisp as automatic (when it works).

Apparently in certain light situations, such as when there are lots of clouds, the focusing mechanism can't figure it out. So we get blurry pictures.

I have just switched it to manual focus, so it will be better now.

I'm heading over this weekend to clean the window of the camera box, so I hope it will help.