Indesign became unusable in our company (21.4.1)

I was wondering if we are the only ones in the world experiencing this.
6 workstations, each with different settings/customizations, yet all 6 have the same problem.

InDesign starts showing the loading circle, as if it is doing something, and we are unable to select any object. Some parts of the application are still somewhat usable.

We find ourselves restarting the app 10 times or more per day, and, of course, restarting the application is not as simple as pressing the "X" button in the top-right corner because it doesn't do anything. We need to open the Task Manager and force-close InDesign every time. We restart, and here we are: after a whopping 10 minutes of work, we need to restart the s***t application again.

We've already tried uninstalling and reinstalling it, deleting all preferences and scripts, and installing it under another user account.