Issues after Index Creation

Hi Experts,

The index creation on the cube goes successful in process chain but We are facing problems after index creation on that CUBE.

Below is the error message which we got in transaction RSDDBIAMON2.

BIA server is overloaded "Number of Times Main Memory Was Unloaded in Last 24 Hours: '3263' "

After this, we have to manually delete the index creation and re create it, then it works fine. no ERROR.

Can anybody explain me what is the actually problem.

Thanks,

Max.