Alignment goes missing in the gpk file

We have created our alignment and profile with SS4 tools, and then exported it to native.  Every so often (sometimes daily, sometimes weekly) the alignment goes missing in the gpk.  The original alignment isn't changed, so we can just export it again, but this seems odd.  anyone have similar issue? It is defined with an alignment feature definition. 

Dawn

Power GEOPAK V8i 08.11.09.878