Today all of our phones slowly crashed, I noticed every extension dialing a *30 as it went down. Some people got disconnected from their active calls while some didn't. Looking on the PBX I saw that there was 98% CPU Utilization from IIS Worker Process and after killing the process everything immediately started working again. I reviewed the event log saw the 2 following entries with a Warning that seems to have appeared every day. 1. A worker process '####' serving application pool '3CXApplicationPool01' failed to stop a listener channel for protocol 'http' in the allotted time. The data field contains the error number. 2. A process serving application pool '3CXApplicationPool01' exceeded time limits during shut down. (Source WAS) Any idea of what would cause this / a fix, or where to begin?