I have an assembly that will randomly suppress a sub-assembly and features.  Two nights ago, I saved and closed my assembly, the next morning I opened it and items were suppressed in some but not all configurations.  Also, my features (patterns in this case) were not only suppressed but when you unsuppress them the items in them (the patterned parts) were also suppressed.  After spending a good part of the day fixing this, I saved and closed last night.  This morning the same thing, a bunch of suppressed items (the same ones).  Has anyone heard of this, experienced it or have some suggestions?