I was shooting today, and I think I did not get too carried away, but somewhere halfway finished with a roll of 36, the camera decided to re-wind on its own. [Canon 1n]. I had this happen once before with an older Canon 650 when the battery was getting low. The battery check button checks out OK, but the battery is about 7 months old and I've been putting a fair number of rolls through it. I will replace the battery in any case before taking a short vacation on Wednesday. But have any of you Canon users seen a similar problem?