Sharepoint 2010 Timer Service Stops Unexpectedly

Environment: 
SharePoint Application Server in a multi-tier medium farm. SharePoint WFE, App and database running on separate servers.

Scenario:
On one of the app server SharePoint 2010 Timer service keeps failing. In Windows Services console window if you start the service, after some moment it will stop automatically.

Looking at the Event Viewer logs on the server reports the following errors.

Error 1 on App Server 1
Log Name:      System
Source:        Service Control Manager
Date:          1/25/2014 11:28:04 AM
Event ID:      7034
Task Category: None
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      SPAppServer1.domain.com
Description:
The SharePoint 2010 Timer service terminated unexpectedly.  It has done this 4 time(s).
Event Xml:
<Event xmlns=”http://schemas.microsoft.com/win/2004/08/events/event”>
  <System>
    <Provider Name=”Service Control Manager” Guid=”{555908d1-a6d7-4695-8e1e-26931d2012f4}” 

EventSourceName=”Service Control Manager” />
    <EventID Qualifiers=”49152″>7034</EventID>
    <Version>0</Version>
    <Level>2</Level>
    <Task>0</Task>
    <Opcode>0</Opcode>
    <Keywords>0x8080000000000000</Keywords>
    <TimeCreated SystemTime=”2014-01-25T16:28:04.344856500Z” />
    <EventRecordID>144167</EventRecordID>
    <Correlation />
    <Execution ProcessID=”524″ ThreadID=”6932″ />
    <Channel>System</Channel>
    <Computer>SPAppServer1.domain.com</Computer>
    <Security />
  </System>
  <EventData>
    <Data Name=”param1″>SharePoint 2010 Timer</Data>
    <Data Name=”param2″>4</Data>
  </EventData>
</Event>

Error 2 on App Server 1
Log Name:      System
Source:        Service Control Manager
Date:          1/25/2014 11:25:04 AM
Event ID:      7031
Task Category: None
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      SPAppServer1.domain.com
Description:
The SharePoint 2010 Timer service terminated unexpectedly.  It has done this 2 time(s).  The 

following corrective action will be taken in 30000 milliseconds: Restart the service.
Event Xml:
<Event xmlns=”http://schemas.microsoft.com/win/2004/08/events/event”>
  <System>
    <Provider Name=”Service Control Manager” Guid=”{555908d1-a6d7-4695-8e1e-26931d2012f4}” 

EventSourceName=”Service Control Manager” />
    <EventID Qualifiers=”49152″>7031</EventID>
    <Version>0</Version>
    <Level>2</Level>
    <Task>0</Task>
    <Opcode>0</Opcode>
    <Keywords>0x8080000000000000</Keywords>
    <TimeCreated SystemTime=”2014-01-25T16:25:04.378034500Z” />
    <EventRecordID>144161</EventRecordID>
    <Correlation />
    <Execution ProcessID=”524″ ThreadID=”848″ />
    <Channel>System</Channel>
    <Computer>SPAppServer1.domain.com</Computer>
    <Security />
  </System>
  <EventData>
    <Data Name=”param1″>SharePoint 2010 Timer</Data>
    <Data Name=”param2″>2</Data>
    <Data Name=”param3″>30000</Data>
    <Data Name=”param4″>1</Data>
    <Data Name=”param5″>Restart the service</Data>
  </EventData>
</Event>

A quick search on Microsoft KB article resulted in the following solution for the DCOM issue

http://support.microsoft.com/kb/920783

At the 4th step of above KB article, I got stuck with the security tab being grayed out. I was running Windows 2008 R2. In short you take ownership for the service account and add full control permissions of the following registry key:

HKEY_CLASSES_ROOTAppID{61738644-F196-11D0-9953-00C04FD919C1}

Default Settings

Farm Service Account with permissions added

Reference: 

I found the following article to enable the security tab for IIS WAMREG Admin. 

Fix the SharePoint DCOM 10016 error on Windows Server 2008 R2

After following above, the error 10016 was gone. I started the Sharepoint 2010 Timer Service but it stopped again after some time reporting the same errors listed above (except DCOM 10016 error) . A review of Central Admin app server, following errors were seen in the Event Viewer.

Start the ‘User Profile Service’ on App Server 2 using Central Admin

Search and visit user’s Profile to Test the working of User Profile Service