Sap Design Studio Data Source "DS_1" not initialized just in BI mode

Dear All,

we have a problem in our system.... actually our dashboards are not launching correctly...

The problem is that, we see the error of DS_1 not initialized periodically... I mean if we launch it now maybe we see this problem but maybe after 5 min we can open it....

I have checked the other questions in forum but others always have this problem! but for us is strange that it is random!

Can anyone help us what can cause this problem?

Thanks a lot

Sin