IDataEvent not fired when publishing after IIS app pool recy

Hi, 

I am just wondering if this is normal behavior, and if it is documented somewhere... 

I subscribe using : 

and than handle using :

I noticed that after IIS recycles the App Pool for this app, there are two less events fired when publishing a new content.  

Have you seen something like it before?  Is there a way to prevent it from happening?  

 I am using Sitefinity 7.0.    

Thanks in advance