Upgrading to RbPi4, I found this little issue: Image below shows left the 3, on the right the 4....best seen with very short (like BIAS) exposure, but still visible with longer exposures. pattern is variable so darks/flats cannot remove that.

Unchanged when using 2.4 or 5Ghz WIFI, unchanged when swapping USB cables around. Unchanged when using different AC adapter. Ended up replacing the RbPi itself, the replacement does the same thing....
I am back to the RbPi3 for now...

Appreciate any insights...

Thanks
Michael

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