Why are my profile links breaking?

Disclaimer: I'm using OpenRail but posted in that group and it was suggested I post in here.

I've had quite a few problems with profiles "breaking" or disappearing from profile views and sheet views. We have to utilize sheets in individual files per client wishes. Seemingly randomly, the links for the profile will break and our vertical alignment disappears from the profile view and the sheet view. The reference tab shows a broken reference to the "attached long section". Annotation remains, but the linework is gone.

It doesn't seem to be correlated with any profile edits or horizontal alignment edits. We do change the level from the feature definition default (specific level for each track, but just one feature definition for all 4).

I have no idea what is causing it, and therefore it's hard to prevent it from happening. Any ideas?