Server shutdown event id 19019

Hi,

I found that sql server 2008 R2 was shut down suddenly today and could not find those details in error log. I was able to find in event log with event id 19019 and user as N/A. Not sure how the server got restarted. This server is not a clustered instance.

Log Name:      Application
Source:        MSSQLSERVER
Date:          29/09/2014 2:40:29 PM
Event ID:      19019
Task Category: Server
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      XXXXXXXXXX
Description:
The MSSQLSERVER service terminated unexpectedly.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="MSSQLSERVER" />
    <EventID Qualifiers="16384">19019</EventID>
    <Level>2</Level>
    <Task>2</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2014-09-29T04:40:29.000000000Z" />
    <EventRecordID>20402239</EventRecordID>
    <Channel>Application</Channel>
    <Computer>XXXXXXXXX</Computer>
    <Security />
  </System>
  <EventData>
    <Data>The MSSQLSERVER service terminated unexpectedly.</Data>
    <Binary>B937000019000000100000004100550030003400550041005000300036003800510041004E00380032000000070000006D00610073007400650072000000</Binary>
  </EventData>
</Event>

Can anyone explain the root cause of sudden shutdown?

Thanks,

Preetha