Logout from 3dSearch database after some time

When I'm working for some time (with brakes Catia V6R2018HF4) it happens that I cannot search anymore, I just get the loading symbol, but no result appears. It looks like I got logged out, but I still can safe parts or create new parts. Shouldn't Catia not recognize by itself that I have to do an relogin? when I quit Catia, I always get then a login Prompt before Catia close.