I just missed the hint for #420339 to include in the prevoius mail. There is a difference in my case: The screensaver works as usual, showing its animations but suddendly it wilkl just "freeze". Mostly, The animation will stop and then the bug is occuring.
Also seen, that the screen is blank (black) when the bug appears (backlight working) . But this could be some power saving as well.
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