esox,
Just because the net is not crawling with a problem doesn't mean your issue isn't legit.
With my second digital back I had a lot of issues and the maker kept saying, "I never heard of that", though three months later would have a fix.
Sometimes things just happen, but I would strongly suggest with the number of issues you've had is to ship the camera, back and lens to the manufacturer with a note that says "Fix this f_____g thing.
I know with my Contax I had an issue and they'd say well, send us the back and I said, uh no, I'll send you the whole case of bodies, lenses and backs and let your work it out. If you want to bill me then fine, but don't send them back until everything really works.
That solved all of my problems and stopped the answers like maybe it's your lens, or maybe it's your back, or maybe it's the fact you live on a shaded street.
IMO
BC