symbol text not displaying

symbol text randomly not displaying.

I've checked and turned on all levels as seen in screenshot 1 & 2.
a check of the symbol connection points shows the data ( screenshot 3)
and if you go to modify the symbol , you can see that the connection point text is displaying
as we expect it to (screenshot 4)

we're also finding this error on some layouts where entire layout symbols suddenly will not display.

when we've checked on our servers , the previous versions (sometimes even 2 hours prior, shows
everything, but something is happening without user intervention which is causing symbology or parts of
symbology to NOT DISPLAY.