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no talk so far on this issue by other members

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Re: no talk so far on this issue by other members

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Just watched a video about star trails (GoPro Star Trails and Traffic Lights Tutorial: Better Night Photos Tonight) and it does mention that hot pixels are a well known problem when using digital cameras for this type of photography. I then searched 'digital camera star trails hot pixels' and found this from How to Identify Stuck Pixels and Remove Them from Your Digital Photos 


"In addition to stuck pixels and dead pixels there is what is known as “hot pixels.” Unlike stuck and dead pixels, which are fixed in place on the CMOS sensor just like a bad pixel on a monitor, hot pixels are a temporary artifact that comes and goes. When a digital camera is used for extended exposures (such as photographing star trails or other photo projects that require exposures that measure in seconds) the CMOS sensor heats up. Pixels that show up as “hot” in a long exposure may never show up again (and other pixels may appear hot in the next long exposure you take)."


Not saying this is the answer to your problem, but it may be a partial reason.