CCM - Domain Object Retrieval Error

I run into the following exception (quite randomly) when running my app
based on the CCM framework. Could someone 
please explain when this exception can occur and ways to avoid it. Due
to the randomness of this error, we
are not in a position to launch our app in production.
 
Thank you
Srini
 
------------------------------------------------------ ERROR TRACE
-----------------------------------------------------
 
This data object is not valid. This usually results from using a data
object that was retrieved during a transaction that has been rolled
back.
com.arsdigita.persistence.PersistenceException: This data object is not
valid. This usually results from using a data object that was retrieved
during a transaction that has been rolled back.
        at
com.arsdigita.persistence.GenericDataObject.validate(GenericDataObject.j
ava(Compiled Code))
        at
com.arsdigita.persistence.GenericDataObject.validate(GenericDataObject.j
ava(Inlined Compiled Code))
        at
com.arsdigita.persistence.GenericDataObject.get(GenericDataObject.java(C
ompiled Code))
        at
com.arsdigita.domain.DomainObject.get(DomainObject.java(Compiled Code))
        at com.arsdigita.kernel.ACSObject.getID(ACSObject.java:201)

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