Switching between projects, losing connections

Does anyone else have this? If I open a new project without closing the first one, and then close the second one and go back to the first one I often lose connections. Sometimes just a group channel that’s no longer going anywhere and is not possible to link to anywhere, Stereo Out or what ever. Or, a Stereo Out that’s not going out. :smiley: Meaning it’s not possible to link to a speaker, nothing happens when I click the buttons.

Lol, now I get disk overload on 10 tracks trying to export, maybe I can send this project to someone at Steinberg?