My install is on a ssd also.
I have changed from lightdm/unity to gdm/gnome-shell and so far (only a few boots) no problems.
I wanted to try out Unity so using gnome is really not what I had in mind.
If it's a race problem it would be solved by installing on a traditional hard drive perhaps.
But that was not what I had in mind either.

Anybody else using ssd?