[Steinar1]

Every manufacture has quality control problems.  The big ones (Canon, Nikon) and the high profile ones (Leica, Zeiss, Schneider, etc) are subject to more frequent and harsher criticism due to their larger userbases.

 

True, but the recent Nikon ones show signs of sending product too fast to market, without proper quality and reliability control. The consequence; people will hesitate buying a new Nikon product until it has been debugged! Pros don't want to have to change a product for these reasons, so rather than running the risk, they change brands. 

Both Nikon and Canon are having product spec issues compared to the more advanced manufacturers, like Olympus, Panasonic and Samsung, not to speak of Sony and the more such quality problems appear, the easier the road to conversion to mirrorless, for example, which was my case.