Problem running adaptive RFC, sometimes works sometimes not, help needed.

Hi, I did a Webdynpro project, I have a login view, when I submit I run a RFC function in R3 that checks if the user exist if exist It bring some data in another view.

In the action of the button submit I have this.

wdThis.wdGetMultiCustController().executeZtrae_Ot_Input();

MultiModel empModel = (MultiModel) DModelFactory.getModelInstance(MultiModel.class);

empModel.disconnectIfAlive();

if (wdContext.nodeTable_Ot().size() == 0) {

wdComponentAPI.getMessageManager().reportWarning("Record doesnt exist"); }

else{

wdThis.wdFirePlugToEntrView();}

My problem is that althought I entry the same data sometimes it shows me the warning message and sometimes it fire the Plug. I wanna know how can I do to fix this problem. I already change the timeout setting in the JCO connector but this didnt help.

Is really a timeout problem ? or what ?