Today my D750 seems to have developed a shutter issue for the second time.
I bought the camera new in August 2015.
In April 2016, something in the shutter broke. Some piece of it was visible in photos, as can be seen in the attached photo. The shutter unit was replaced ander warranty (I am not sure if anything else was replaced as well, they were not prepared to go into details or show me the damaged components). And while I was very glad that the work was done free of charge, it took about 6 weeks...
This morning, the shutter seemed to jam. The synptoms appear similar to this video:
https://www.youtube.com/watch?v=go1SaHjICkMHowever, every account I have read of similar synptoms seem to mention that it only happens at 1/4000th of a second, and normal function is restored at lower shutter speeds.
Mine, however, happens at all shutter speeds. When pressing the shutter button, the mirror lifts up (as if mirror-up drive mode is selected), and nothing further happens. Pressing the shutter button again causes the miroor to close in a much more noisy fashion than normally, seeming to "bounce" several times. The shutter does not operate at all during this process, and a completely black photo is recorded to the memory card.
I have removed the battery several times, changed lenses several times, tried every drive mode and several exposure modes, nothing seems to make any difference.
I don't know what the shutter count is, but I doubt it's more than 40 000 in total on both shutter mechanisms.
My questions:
1) Has anybody experienced a similar failure?
2) Could I have done anything to cause this failure?