Bug - Text Frame Blanks Randomly While Using

Ever since the most recent update, text frames regularly look blank as I work within them. They have text, character styles, paragraph styles, and occasionally objects, but as I apply a new character style to one line, the contents of the frame will disappear.

This is very disruptive. The only way I have figured out how to get the entire frame to momentarily reappear so that I can see my work is to click on the frame and adjust its position. Typing within the frame may reveal the line or lines near where I am typing, but not the entire frame.

This problem did not exist before this current iteration of InDesign (v.21). 

I work with a team and we have all tried various ways of avoiding this issue, but have not figured out how. It doesn't seem to change based on our display performance, screen mode, transformation values showing or not, whether we've reset our cache, or if our GPU performance is checked or not.

Are other users having this issue? Is there a resolution?

It is getting to the point where every edit within a text frame is causing a glitch and disappearance.