Issue:- UPA Sync Service will stop functioning intermitently. During troubleshooting, you may not find any errors or Event's logged for this. You may also notice that the Timer Service is crashing every 2-3 mins if you keep an eye on the Services console.
Troubleshooting:- You can use Microsoft Procmon Tool to check if any Service is causing it crash or what might be interrupting the UPA and Timer Services to function properly.
Resolution:- Anti-Virus software is the main cause for such issues. Once you exclude SharePoint folders following the below article you need to restart/re-provision UPA and UPA Sync Service from Central Administration page.
Certain folders may have to be excluded from antivirus scanning when you use a file-level antivirus program in SharePoint
http://support.microsoft.com/kb/952167
Troubleshooting:- You can use Microsoft Procmon Tool to check if any Service is causing it crash or what might be interrupting the UPA and Timer Services to function properly.
Resolution:- Anti-Virus software is the main cause for such issues. Once you exclude SharePoint folders following the below article you need to restart/re-provision UPA and UPA Sync Service from Central Administration page.
Certain folders may have to be excluded from antivirus scanning when you use a file-level antivirus program in SharePoint
http://support.microsoft.com/kb/952167
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