We have not been able to reproduce this on our side. We would love to fix it but simply are not getting the feedback we need. I apologize for this issue however while some have reported it, it seems to be some unique part of a workflow. I suspect it is a particular SW operation or a combination of steps that creates the problem. It seems top have to do with:
1: Deleting Power Bodies in the tree.
2: Going from Solid to surface or surface to solid.
3: Creating multiple Power Bodies from a single subD conversion.
Anyways, if you are able to reproduce it, that would help immensely. Typically, we get a customer contact us that the problem has happened and when I reach out, I never get another reply. Additionally, some customers who do experience it end up changing their workflow to basically just import and convert when necessary without worrying about the connections. This is unfortunate.
When I get customer files, other possibilities for the source of the problem is that some users manually load and unload our add-in at times, which can cause problems with maintaining our 3rd party data within the part file. If we aren't around to load or save, major problems can occur.
I apologize but appreciate your message.