I have never had problems with the shutter release, but then I don't have a soft release. If I have a shutter release cable in the unit, and I try to review an image, I have to muck a bit with it to get it to take the 1/2 press, and sometimes with the cable release locked in, the shutter button can slip down a bit and stay there until I pull it back up a bit. That's the only thing I've ever noticed, but it hasn't really been a real issue for me.
Sounds like you may have a faulty switch mechanism. That's probably something for Epson to fix... If so, I hope they are quick with a replacement and that it is well aligned and in good order...
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