Where does this instability come from?

Hi,

I'm currently using the Trados Studio Freelance 2019 SR2 version (15.2.8.3002). Unfortunatetly, since a couple of days I'm experiencing some instability while I'm translating. By example when I'm trying to translate the five or six first segment of a file, these are systematically covered by the Project Settings window, which disappears when I click one more time on the segment I wish to translate. Another problem is when I try to make a contextual search (F3): the contextual windows appears not even one second and disappears right after this. I restarted Trados several times, but nothing changed.

I'm running Trados on Windows 10.

Thank you in advance for your help.

David