This is something that has been in effect in SQL Server 2012 and in SQL Server 2014 under Windows 8.1. Once installed, all is ok. I can access the databases and everything works. This remains as is for as long as the Ultrabook does not go to sleep. If I put it to sleep, when I try to connect to my database, it cannot. Once I go in SSMS, I can see that both databases are in Recovery Pending. This will remain like that forever.

When the Ultrabook is awake, I can see a dialog on the desktop saying the server is busy, you know that famous Retry, Ignore dialog when an application in the Task Manager is not available.

This is probably related to the situation. The only way to resolve that is to reinstall all the time. Of course, this does not make any sense. If someone has an idea on how to fix it, it would be greatly appreciated.