linux sql*loader 500,SQL Loader Error 510 SQL*Loader-510: Physical record in data file is larger

I am attempting to load data into an Oracle database table (Oracle 11gR2) using sql loader. I am able to load a test file of 1 million records that was sent from our lead company using the control file shown below. However, when they sent the actual files (total of 70 million records) and I tried loading the first file of 1.7 million records which is supposed to be in the exact same format as the test file (and appears to be - text file, comma delimited, same fields), the file will not load using that same control file and I receive the error shown below the Control File. I hope you can help.

Control File

OPTIONS (silent = (feedback, errors, discards, header), direct = true, READSIZE = 20971520 )

unrecoverable load data

infile 'M0000396_Group3_Final.txt' "str ''"

APPEND

into table T3_UNIVERSE

fields terminated by ','

OPTIONALLY ENCLOSED