SSIS Hung Or Exited After A Long Foreach Loop

I am having some problem in running SSIS scheduled job.
The job is processing (updating and inserting) batches of data using Execute SQL Task inside Foreach loop container. But to make sure the batch complete successfully I put the "Begin Tran" Execute SQL Task and "Commit Tran" Execute SQL Task before and after the foreach loop
My workflow is like the following....
- Execute SQL Task "Begin Tran"
- ForEach Loop Container for a batch of records.
- Insert the records into the database
- End ForEach Loop
-Execute SQL Task "Commit Tran" if the above ForEach Loop complete successfully
-Execute SQL Task "Rollback Tran" if the ForEach Loop failed

Normally the insert records are around 10~200 and the job is running very fine...
But if the records are more than 1000s then sometime the job hung (I would say hung because the DTEXEC.exe can be seen inside the windows task manager.) There was no indication what so ever whether the job finished or the job failed or the job else....

Can anybody help to find the cause.....

Rgds,

KyawAM