I was wondering if anyone else had their 60D lock up with long exposures. Mine first did it during a 1/2 hour shot of the stars, on a pretty cool (25 degrees farenhiet) night. It has since done it at 5 minutes, and as low as 30 seconds one time. I have used different lenses and SD cards, all class 10. It freezes while trying to save the file. I thought the higher the ISO the more it had to process, and maybe that did it, but it froze on me at ISO 800, 5 minutes one time also. I would say I have had this happen about 5 times now. Also in perfectly warm weather. Just curious on thoughts. Should I shoot raw? Thanks fellow shooters.