Java APIs

Hi,
We are running an RMI server instance to serve data ( from memory) to clients. It works fine if fewer number of inquiries goes in. But when the number of inquiries are larger, I am getting some exceptions at the client side. The server crashes without throwing any exceptions. Following are the exceptions received at client side:

java.rmi.UnmarshalException: Error unmarshaling return header; nested exception is:
java.net.SocketException: Connection reset
at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:203)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:133)
at com.emf1.dataserver.KeyFrequencyKeeper_Stub.getDUNSCounts(Unknown Source)
at com..match.KeyFrequencyKeeperProxy.getKeyKQSs(KeyFrequencyKeeperProxy.java:307)
at com.emf1.match.KeyGenerator.generateKeys(KeyGenerator.java:453)
at com.emf1.match.InquiryProcessor.run(InquiryProcessor.java:870)
at java.lang.Thread.run(Thread.java:534)
Caused by: java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(SocketInputStream.java:168)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:183)
at java.io.BufferedInputStream.read(BufferedInputStream.java:201)
at java.io.DataInputStream.readByte(DataInputStream.java:331)
at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:189)
... 6 more

The period of time, the server keeps on running (before it crashes) is also not the same. Sometimes it works fine without any problem. But most of the time the server crashes after processing some records.

I don't know why this is happening.
Please help...

Thanks in advance..