I was out covering a Frosh (aka freshman) parade two weeks ago and my K100D was starting act weird during the parade. Like it would emit this low volume squeal when I pressed the shutter button. (SR was off, temperature was normal. Low 20-something Celsius? or ~70F) I thought it might have been my ownuser K100D grip so I took it off and put 4 fresh NiHMs into the camera.
Moments later it would stop talking pics again. I tried turning it off and then on again but it was still bugged. Then, I took off the lens, remounted. After two-three cycles, the camera will return to normal. But 4-5 shots later it would again refuse to take a picture. At first I though it was the AFswitch on AF by accident but that wasn't it either.
After the parade, rain sprinkled for a few seconds so I put the camera away for a good 10mins or so. When it stopped, I took the camera back out, Lens and Ownuser Grip and the camera was fine again. No hiccups after that.
I thought maybe it was because of the sheer volume of photos I was taking that day and the camera was getting stressed out. I was gonna take it back to the store to inquire but the hiccups was only during the parade and it hasn't given me a problem since.
I was just browsing around on DPR active forum box just now and saw the "
40D bites the dust." thread and had a good chuckle. But, if a 40D CMOS sensor can 'overheat' and then refuse to take photos, I realized that it could have been the case for my K100D during the parade. What do you guys think?