I want to know if there's a problem with my camera.

I had photoshoot last nov.17, using the following settings:

Shutter-Priority, ISO 160, Shutter Speed 100, Aperture 2.8-3.5, white balance set to "shooting outdoors in fine weather".

I must say that the pictures, as I transferred them to my computer and viewed them, even 1:1 on monitor, delighted me much. Pictures were perfectly focused, exposed and sharp. I can even trace a hair and tell its focused. I ran out of batteries and decided to charge it, and then continue shooting. I got same "quality" of pictures with my first shots, however, in the middle of the session, I noticed that some were Out of Focus, and underexposed. The Shutter speed of 100 which I usually use seemed to produce underexposed images. Im bothered. It is my first time to use the in-camera flash extensively for most of my images. Is it the cause? Was the camera "exhausted" after prolonged, continued use?

I conducted test shots, played with the settings. The camera displays OOF "the red hand with !" when I shoot portraits using shutter speed 100, which does not happen before. So I slowed the shutter speed to 40, and it focused, but still, the images look underexposed, and seem to be a bit soft, compared to my first regular shots. I removed the batteries and let it rest for a couple of minutes, but had the same results. I can say that the images are far fetched from the quality I usually get. Before, at shutter speed of 100, even at 160, I can still get properly exposed images. Now at this speed, I get underexposed images, even if i adjust it to 40.

What can be the problem with my camera, and what should I do?

Thank you very much.

try P mode & see the difference, i use to own 3 of this cams & they where nice use at that time.

http://www.dcfever.com/photosharing/photos/20040801/l752601092236525.jpg

still, the images are underexposed

Have you tried to look at your exposure compensation setting? maybet it was set 2 stop under or more.

i had the camera for check this day at fuji's main office.. they say nothing's wrong. but i can 'feel' that my images are underexposed 'as compared to the previous images' my camera captures, using the same settings i've been using before.

Oh my God.. I'm so happy.. my camera is in perfect working conditon right now, just like before. I brought my camera with me and visited Sta.Clara Church, the one in Katipunan, QC, took some pictures and viola! when I transferred them to my PC it had the same image quality my former pictures has. I don't know what resolved the problem, except that I set the ISO to 200. Maybe a miracle? hehe. Whatever it is, Im truly thankful. =)

Hmm, my far-fetched hunch is maybe your batteries are not performing properly (if AAs, maybe one of them are starting to wear off).