On computers where the Central Statistics Server (CSS) software is installed and is CPU/Memory/Disk bound for periods of longer than an hour, IIS periodically recycles the PerformanceManagerPool every hour.
The Default settings on the PerformanceManagerPool are incorrect.
This can be resolved by making the following changes in IIS:
• Set Startup Time Limit (seconds) to 90.
• Set Ping Maximum Time Limit (seconds) to 90.
• Set Regular Time Interval (minutes) to 1740.
• Start the PerformanceManagerPool Application Pool if it is still disabled by RFP.