One of my IPS running well and viw event report in event viewer. but suddenly no event come in event viwer. at first i think corrupt the event viwer and install another pc but same result. My sensing interface up and management interface also up. when I excute show events 12:00:00 then event dispaly but when i excute only show events then no response. I already reboot it. but no result so what i take the step ?