The "New File" window is opening when I'm pressing the space bar to use the "Hand" tool

Hi everyone ✌️ 

For exemple when I am switching from a current window like Opera browser to Illustrator window, in which I'm working on an already opened projet. And then I am trying to navigate through my project with the Hand tool by pressing Space, a New File window is opening instead.

The problem last for a few seconds and then illustraor is working like usually, but when I switch again to another window, the problem comes back.

It's really time consuming.

I tried to uninstall and reinstall but the problem persits.
Should I go to an older version of Illustrator ?

I'm working on macOS Cataline 10.15.2 with the last version of Illustrator.

Thank you in advance to all those who will try to help !