InDesign 2019 randomly hangs - only while opening or closing documents on macOS

Indesign 2019 (14.03) randomly but consistently hangs while opening or closing documents. It does this with a multitude of different files without regularity and without warning. Sometimes it opens smoothly five documents and then hangs on the sixth, sometimes it opens two and hangs on the third. Sometimes it also hangs on close (not on save). Sometimes it also hangs on the recovery process, but usually it opens up again just fine. I never use "recovered" versions anyway.

Also, sometimes I close a document and it seems just fine, then I close Indesign just fine, THEN I open it again and it "recovers" the document it had regularly saved and closed before.
This tells me that for some reason sometimes the program cannot get rid of the recovery copy when closing the file.

No previous version has exhibited this behaviour. System is macOs Catalina. It seems to be getting more frequent lately, but maybe just because I'm using this version more than before.
I also have 2020 installed, and it doesn't present the problem, so far.
I have no third party plugins.
It maybe relevant that the vast majority of these indd files are inside a synced dropbox folder. I use indesign files on dropbox folders since CS6 and i never had any problems, could it be? I will try moving some work in a non shared folder and see what happens, anyway.

I already tried resetting preferences. Maybe I'll try rebuilding the caches? Any other ideas?
Wouldn't like to reinstall as the version isn't distributed by Adobe anymore, so I'd have to download installers from the internet.

I'm attaching the macos log from the crash.

Thanks

{Renamed by MOD}