WCF DataContract deserializing complex types

I have a service that returns a collection of MyClass objects. If all instances of MyClass are null in MyClass2Reference, everything works fine. Otherwise, a "Connection reset" message appears on the client side. What am I doing wrong?

[DataContract]
public MyClass
{
[DataMember]
int ID;
[DataMember]
MyClass2 MyClass2Reference;
}

[DataContract]
public MyClass2
{
[DataMember]
int ID;
[DataMember]
string Name;
}