Problems with the Application Module Pool

Hello,
We have an Oracle ADF Application working in a production enviroment. The application module pool seems to work properly during the first days, but after a few days, the application module pool seems not to work properly. We start to get some errors like JBO-30003: the application pool failed to checkout an application module.
We have included in the application a DumpPoolStatistics servlet, and what we have observed is:
1. When the application is restarted in the server, the "total number of application modules in the pool" is equal to "maximum number of application modules in the pool".
2. Several days after, the "total number of application modules in the pool" starts to decrease.
We don't know why the "total number of application modules in the pool" starts to decrease, but we think this is the reason of the errors. In fact, "total number of application modules in the pool" is lower than the "jbo.ampool.minavailablesize" parameter value.
The management of the application module pool is not a task of the developer, so we don't undestand where is the problem.
We have configured the application module with the next parameters:
<jbo.ampool.initpoolsize>10</jbo.ampool.initpoolsize>
<jbo.ampool.maxpoolsize>100</jbo.ampool.maxpoolsize>
<jbo.ampool.minavailablesize>10</jbo.ampool.minavailablesize>
<jbo.recyclethreshold>15</jbo.recyclethreshold>
<jbo.ampool.maxinactiveage>600000</jbo.ampool.minavailablesize>
<jbo.ampool.monitorsleepinterval>600000</jbo.ampool.monitorsleepinterval>
<jbo.initpoolsize>15</jbo.initpoolsize>
<jbo.maxpoolsize>30</jbo.maxpoolsize>
<jbo.poolminavailablesize>15</jbo.poolminavailablesize>
<jbo.poolmaxavailablesize>25</jbo.poolmaxavailablesize>
<jbo.poolmonitorsleepinterval>30000</jbo.poolmonitorsleepinterval>
<jbo.poolmaxinactiveage>30000</jbo.poolmaxinactiveage>
<jbo.dofailover>true</jbo.dofailover>
<jbo.ampool.resetnontransactionalstate>true</jbo.ampool.resetnontransactionalstate>
<jbo.ampool.doampooling>true</jbo.ampool.doampooling>
We are working with JDeveloper 10.1.3.4.
Thanks in advance!

Sorry, you are right, the number of application modules created whe the application starts is given by the jbo.ampool.initpoolsize. But what it is sure is that the "total number of application modules in the pool" starts to decrease. The number of days is not always the same. But we have to restart the application occasionally.
I think the time parameters are ok, I would like for example 10 minutes for pool resoruce cleanup, and 10 minutes for considering an inactive AM instance in the pool as a candidate for removal during the next resource cleanup.
<jbo.ampool.monitorsleepinterval>600000</jbo.ampool.monitorsleepinterval> --> 10 minutes
<jbo.ampool.maxinactiveage>600000</jbo.ampool.minavailablesize> --> 10 minutes
Is this right?

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