So, the reboots are few and far between, which still makes this TV better than a refurbished set that would likely be sent as a replacement at this late date (new one never materialized).
I will wait for it to fail completely before asking again. Meantime, I've cranked the backlight up to +4 and tinkered with the blue color. I turned the value (brightness) of the blue all the
way to maximum, turned the color intensity of the blue all the way down and turned the hue of the blue all the way to cyan. Almost nothing changed! The overly-blue appearance of
some images is improved, but not what you would expect by pegging the values all the way at their limit. As the LEDs age, the yellow phospohor will fade and the blue will be even
worse. Hopefully, that will be many years from now. I'm not happy with the cyan on this set, but that seems to be a product of the blue pixels being too purplish rather than any problem
with the green -- it makes nice deep saturated greens, thanks to the yellow pixel relieving it of its 'mixing' obligation with red to make yellow. Anyway, life goes on...