We have had details and sections that have unlinked themselves over the last 2 months. The most recent example occurred on a sheet of wall types.
A month ago I made about 20 independent details -- one for each wall type, then I placed them on a layout. Today another user tried to right-click on one of them so he could pop it open and steal the geometry for another wall type, but "Open source View" didn't appear in the context menu -- even though we had done this several times before. He went to the Drawing Settings and relinked it (it already had the right view number), and ArchiCAD thought about relinking the drawing for well over 60 seconds. Then, of course, the context menu had the "Open source View" option.
My first questions is, why would this happen? Nobody on my crew unlinked anything. We've been losing links here and there for the last month for no apparent reason.
My second question is, why would it take over a minute to relink a drawing that seems to already know it should be linked to a specific view? We previously had to relink about ten views on a sheet of details so we could update them, and it took over 15 minutes. That's just ridiculous!