Just took delivery of a new A7r III bought from B & H. Did some time exposures last night (ISO 800 for :10 sec) and there are literally thousands of red, blue, green, white pixels covering the frame. I have never had or seen a camera perform this poorly in low-light. I used another A7R III to film in a ghost town in Colorado (ISO 6400 for :15 sec) back in July and it performed flawlessly as it should. I tried the recommended method of changing the date to re-map with no success.
And of course B&H is closed today and will close again tomorrow till Oct. 3 and I have a job lined up Oct 5.