first problem, you did a "Save for web" which killed the exif data... so no idea what camera you are using.
Second, it looks like your camera has some pixels which are over active when stimulated in long exposure for misc. values.
On my 20D, I had 4 or 5 pixels which did this, but always in a light grey value, not misc. RGB's like yours. I don't think your camera is dying, unless perhaps it is some upper model Canon or Nikon or something.
I think the technical name is "dead pixels" but its not the most accurate name, since it only happens on long exposure (same as when my 20D had the grey pixels.... which were only noticeable when flipping from one image to the next.)
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