If you print spooler continues to drop offline for unknown reasons, follow this post to troubleshoot and resolve. Mileage may vary depending on your environment:

In our case, the print spooler is running into Event ID 337:

<a href="http://egroup.jasonmangone.com/wp-content/uploads/2011/10/PrintSpooler1.jpg"><img class="size-full wp-image-5389 alignleft" src="http://egroup.jasonmangone.com/wp-content/uploads/2011/10/PrintSpooler1.jpg" alt="" width="652" height="451" /></a>