Whenever phone restarts the Display > Display size and text > Font size/Display size (sliders) always revert to a default that is different from what I set manually. This also occurs upon restart after I press "Reset settings" at bottom of that settings page. For ex if I set both sliders to the middle notch, upon restart the Display size marker is all the way to the right--however, strangely, everything in UI actually appears extremely tiny.
This is unpredictable, as sometimes after restart the slider locations and associated UI remain as set.
Additionally, (after restarting a few times to observe this process) my home screen icons and widgets have become re-arranged, with the widgets in tiniest size, and everything in a different location on the screen, with app grid apparently having changed too. OK, this I fixed by simply resizing the widgets , moving the icons back to previous positions, and changing app grid back to how it was before.
Also, if possibly related: I notice that during restarting, the GOS logo appears normally, white on black screen, but then suddenly for a few seconds appears in a black rectangle at upper left of screen on top of my lock screen wallpaper, before logo disappears and lock screen fully appears. I do not recall this to be part of the usual GOS restart visuals.
All the above suddenly began just a few days ago.