When you say it stops, what exactly do you mean?
I suggest you start by checking the jobs related to the entry under Admin Console->Batch Process Control to see what’s done when and what’s pending. Then also go to the relevant worker’s log under /opt/kaltura/log/batch/ to better understand why the execution may be delayed.
Note also that the storage export process involves more than one worker so, you may have:
enabledWorkers.KAsyncStorageExport = 3
enabledWorkers.KAsyncStorageExportCloser = 1
Thus 3 concurrent batches/Storage/KAsyncStorageExportExe.php will run but only one closer and the cycle will not finish until the closer is run.