Error with Connection to Oracle with Wallet , JDBC, and UNIX

Hello - our application has been getting this error periodically while connecting to an oracle database using OCI JDBC drivers.
caused by: java.sql.SQLException: ORA-28759: failure to open file
at oracle.jdbc.driver.DatabaseError.throwsSqlException(DatabaseError.java:125)
at oracle.jdbc.driver.T2CConnection.checkError(T2CConnection.java:681)
at oracle.jdbc.driver.T2CConennection.logon(T2CConnection.java :362)
at oracle.jdbc.driver.PhysicalConnection.<init>
at oracle.jdbc.driver.T2CConnection.<init>
at oracle.jdbc.driver.T2CDriverExtension.getConnection
at oracle.jdbc.driver.OracleDriver.connect
at java.sql.DriverManager.getConnection
at java.sql.DriverManager.getConnection
Once we get this error we keep getting it and are unable to get a connection until we restart it. the file it has the issue with is the cwallet.sso, which I figured out by turning on tracing. The file is there and it gets the connection originally - but for some reason periodically we lose access to that file. But when we get the error the file is there and when we restart the process it's perfectly fine.
The only way we have been able to replicate this error is by create a sameple JAVA app which just keeps opening connections to the database with the wallet without closing the connections. Everytime we hit the 50th connection that error appears and it's unable to get another connection. If we close the connections everytime it's alright.
It's not a limit on the amount of connections to oracle because we have no limit set. The best explaination we can find is that unix has some sort of limit on how many concurrent accesses to that file can be done within one process. We have been unable to figure out that limit. We tried playing around with the file descriptor limits to see if it gets more or less then 50, but no luck.
If anyone has any other suggestions it would be greatly appreciated - we are stuck right now.
Thanks!

No suggestions?

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