Hi, as per the title really. I've now experienced this symptom on two totally separate installations of SQL Server 2012 SP1 configured to use Managed Service Accounts.
This is SQL Server 2012 Enterprise, the Database Engine Service is configured to use a Managed Service Account which works absolutely fine... until the 30 day mark when AD issues the (as intended) password change. The Database Engine doesn't recognise the password change and simply stops servicing requests without any real indication that there's a problem in the Event Logs.
SQL Server 2012 SP1 is running on a fully patched Windows Server 2008 R2 system and despite scouring the web, I can't find any indication of a reason for SQL not handling the password changes by AD.
Any help greatly appreciated.