Porrohman,
There were indeed 3, but I was referring to the 2 that were the same cause. The 3rd was some months later and down to a different mechanical reason.
There have been numerous gear issues on the Dash q400 some of which have not even found their way into wiki.
Drawing parallels betwean this incident and previous ones is a fairly useless exercise as, if the cause is indeed mechanical I suspect it will be yet another new issue and it will be some time before the investigation reveals their findings.