LOD asset disappear

Hi everyone,
I’m using unity 3.5.1 and sometimes some LODed objects lose their meshes for no reason.
When I launch the editor I discover that one LOD doesn’t have anything inside anymore, randomly.
Have you ever had this problem?

Could you please explain the issue you’re having in a little more detail? For example is this an LOD Group you set up in Unity or do you have the LOD meshes set up in your 3d app and import that. Are there multiple mesh renderers per LOD level or just one? Does it keep happening to the same LOD Group or to multiple ones? Is the LOD Group a Prefab?

It’s a LOD created in unity, the last one was a multiple mesh and it’s totally random.
Sometimes this happen when I quit the application while it’s running without stopping it.