windows service not executing because of

I was written a service which will execute a particular job for the scheduled Intervals. But After Some time it will getting stopped.

Faulting application name: Xhr.WindowsServiceHost.exe, version: 1.0.0.0, time stamp: 0x54e5a1d6

Faulting module name: commpro.dll, version: 0.0.0.0, time stamp: 0x4c9dd79a

Exception code: 0xc0000409

Fault offset: 0x000025bc

Faulting process id: 0x2ea4

Faulting application start time: 0x01d04c2193b449f4

Faulting application path: C:\SyncTool\WindowsService\Xhr.WindowsServiceHost.exe

Faulting module path:C:\SyncTool\WindowsService\AttendanceDevices\ZkemSdk\dlls\commpro.dll

Report Id: be25365f-b823-11e4-be86-f8bc12a64328

Faulting package full name: 

Faulting package-relative application ID: 

The above error is showing before service is stopping. and if I restart the service it is executing for some 6 to 7 times and then again getting same error and stopping the service.

Any one please help me to solve this issue. Thank in advance..

I also used auto Recovery but of no use.