I have a 60D camera that I have set to never turn off however after 5 or 10 minutes it does. I'm using the camera as a webcam. I have done this with both an AC adaptor as well as a full battery. I do not have an SD card in the camera... it works great for about 5-10 minutes (however it has gone 30+ minutes a few times) then it just turns off. The camera is not warm at all so I don't think it's overheating... Any suggestions?