Sure, what I noticed is that just before it happens, we have also the following warning in another log file:

2023-07-24 09:32:01,343 [[ACTIVE] ExecuteThread: '22' for queue: 'weblogic.kernel.Default (self-tuning)'] WARN o.h.e.internal.EntityEntryContext - HHH000480: A ManagedEntity was associated with a stale PersistenceContext. A ManagedEntity may only be associated with one PersistenceContext at a time; EntityEntryeu.europa.ec.estat.disschain.ref2diss.model.Process#402382(READ_ONLY)

I think it’s probably related