Had focusing problems, takes a few shots then "freezes", almost as though it cannot recognize the lens, try to focus on other objects and after 2 - 3 attempts will restart. Happens on all settings (have not used it on auto but if I switch to auto while in fault mode it works). Used 4 different lenses all get same fault . Purchased March 2013, returned to Canon via retailer who say no fault found and that I may be using wrong settings, if this is the case why does it work for a short time then pack up then resume on same settings. Used Mk 11 before this and when working this camera is is a delight to use.