I recently replaced my aging but well dialled in FLSun Q5 with an Elegoo CC2.
I am very pleased at being able to print much larger things, but I get this effect at height. This is an egregious example but even cleaner prints still have obvious layer shifts.
I thought that. It was a fresh roll of elegoo PETG, had silica in and vacuum sealed. More than one print failed in this way too.