I've got a Leica R7 from someone and I just noticed that sometimes when I take a photo it takes more than a second or even two!! Between the mirror up and the actual shutter release.
First I thought it was random, bun then after some dry firing I noticed it happend ALWAYS when I aim the camera down at the floor for example, sometimes when I aim it straight in front horizontally.. and it has never happened yet when aiming it at the ceiling...
First I thought it might be a computer lag because it has to calculate different light strengths so I tried it in manual with the lens cap on. An