I've never had a camera for long enough for its shutter to go beyond its life expectancy - until recently. I've been using two 5Dm4 for weddings for more than two years now; I didn't check their shutter count but I estimate they are probably near or beyond 150,000. Recently, one of them developed a strange fault: the shutter stops working every 500-1000 shots. The mirror gets stuck open, and the camera stops reacting to the shutter button until I remove the battery (simply switching the camera off doesn't help). After I put the battery back, the mirror gets to its normal closed position and the camera continues working normally for another 500-1000 shots.
Is this how shutter failure (or getting close to shutter failure) looks or is it something else?
Is this how shutter failure (or getting close to shutter failure) looks or is it something else?