Wireportserver.exe is consuming 100% cpu

Hi Experts,

We are using SAP BI 4.0 sp6 windows for our BO Application.From last week onwards we are experiencing system freeze as the WIreportserver.exe consuming 100% cpu.we have to manually kill it to make the system work again.Even restarting the servers doesn't help!

Sometimes this issue happens when if there are no user logged in.Recently there are no changes made to the server.Hence not sure what

might be the reason behind this.

Thanks in advance for your help.

Regards

Kishore