c3p0 not releasing connection when max_size reached

I am trying to execute a get on the database 10 times in one method. I am using Hibernate 3.5.x and Spring 3.2.13 with c3p0 0.9.5.

My hibernate.cfg.xml contains the following:

<property name="hibernate.c3p0.acquire_increment">1</property>
<property name="hibernate.c3p0.idle_test_period">300</property>
<property name="hibernate.c3p0.max_size">10</property>
<property name="hibernate.c3p0.max_statements">0</property>
<property name="hibernate.c3p0.min_size">10</property>
<property name="hibernate.c3p0.timeout">600</property>

This all works fine with the debugging from c3p0 saying:

[managed: 10, unused: 0, excluded: 0] 
[managed: 10, unused: 1, excluded: 0] 
[managed: 10, unused: 2, excluded: 0] 
[managed: 10, unused: 3, excluded: 0] 
[managed: 10, unused: 4, excluded: 0] 
[managed: 10, unused: 5, excluded: 0] 
[managed: 10, unused: 6, excluded: 0] 
[managed: 10, unused: 7, excluded: 0] 
[managed: 10, unused: 8, excluded: 0] 
[managed: 10, unused: 9, excluded: 0]

This all happens very quickly (less then 0.5 secs)

But if I add an extra get i.e. 11 then I get the following:

[managed: 10, unused: 0, excluded: 0] repeatedly

It does not change until the connection times out.

I am using Springs Transaction Manager like this:

<bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory" />
</bean>

<tx:annotation-driven transaction-manager="transactionManager" />

and use the following which basically calls findOne()

public abstract class AbstractDAO<T extends Serializable> {
    private Class< T > clazz;

    @Autowired
    private SessionFactory sessionFactory;

    public void setSessionFactory(SessionFactory sessionFactory) {
        this.sessionFactory = sessionFactory;
    }

    public void setClazz(final Class<T> clazzToSet) {
        clazz = clazzToSet;
    }

    @Transactional
    public T findOne(final long id) {
        return (T) getCurrentSession().get(clazz, id);
    }

...
}

Please let me know what other information may help diagnose.

What could I have done incorrectly?