electronic is always a heng/sway issue. if you lucky can get a set that lasts for a long time before anything happens...or even to a pt you wonder why it never spoil and you cant get new one cos this old one still going strong.
if you sway one buy back 2 days only why flash cannot fire, af not working, got dead pixel...button loose, card door cannot close, Err error when access card.....think you get the point...there are so many things in the DSLR that can go wrong!!!
the power on/off wonder solution works for a lot of hang problems...PDA, handphone, laptop even my polar watch also like that. same w the dslr...got use to it liao....hang or got problem nevermind, as long as can be settle then its fine.