"Could not create JCOClientConnection for logical System" error

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I get this error each day around 3 PM, like the JCO connections where never released...

What should be the JCO settings for this simple app, can someone help me understanding the way to configure JCO connections (or a pool) properly?

- 1 application (expirationTime 1 hour, logon using SSO ticket);

- Uses 4 RFC models : A (calls one R/O RFC function), B (calls one R/O RFC function), C (calls one R/O RFC function) & D (calls one R/O RFC function and one update RFC function);

- all the 4 models uses the same JCO destinations : WD_MODELDATA_R3_STANDARD and WD_RFC_METADATA_R3_STANDARD;

- users : 10 (who could possibly work in up to 4 windows);

Note that I've added these lines in the CC of the models, good idea or not?

- CC of Model B (before the RFC call) : reuse of the the ModelA connection using "Model1.setConnectionProvider(Model2)" command.

- CC of Model C (before the RFC call) : reuse of the the ModelA connection using "Model1.setConnectionProvider(Model2)" command.

- CC of Model D (after the RFC call of the update function) : "model.disconnectIfAlive();" command.

Thanks for your help!