I have an assembly, in the assembly i have a sub-assembly inserted twice.  sometimes it is fine. other times, one sub-assembly shows it with missing parts. (same config)  i try to rebuild, and reload, but doesn't fix it.  if i open the sub-asssembly, everthing is there.  it will fix itself, when it feels like it.  But this constantly happens on and off.  Has anyone had this type of thing happen to them?  Is there a fix? see below image.