Shutters don\'t have a fixed lifetime only a rating as to average clicks to failure. I had some last 500K clicks and some last 4K clicks. Nothing scientific. The repair facility to my knowledge does not reset the shutter count but they certainly can, need to discuss that with them. Some people regularly replace shutters when they approach rated average, most people don\'t. You need to take a look at the clock battery first before you go off the deep end. I presume from your comments that your cameras are well out of warranty. If it is not the battery only a repair facility can tell you what\'s going on and so it never hurts to sent it in. Early firmware in D300\'s had a strange problem with what appeared to be battery failure. I also presume you have the firmware totally up to date in the bodies.
