Oracle client backups are failing with 233

The oracle client is failing to take a backup , intermittently it is giving db_Image failed: End of file encountered 233. the other backup policies are successfully executed.

Client and Server are on Netbackup 6.5.6

Troubleshooting: Increased the virtual memory, created the MAX_FILES_PER_ADD touch file on the media server and set the number to 100,000 no success.