Multiple MSExchange RBAC events every second (event ids 264, 268, 270)

Hi,

Every second our Exchange 2013 server is writing multiple MSExchange RBAC events to the Application Event Logs, event ID 264, 268 and 270.  It has been doing this all day.

The contents of the events are:

264 - (Process w3wp.exe, PID 15836) "User: Administrator@riddlesdown.local Org:  got the VanriantConfigurationSnapshot"

268 - (Process w3wp.exe, PID 15836) "Cmdlet: New-TransportRule, parameters (EncryptMessage,DecryptMessage) are disabled."

270 - (Process w3wp.exe, PID 15836) "Cmdlet: Set-TransportRule, parameters () are enabled."

Can anybody suggest why it is writing so many events in such a short space of time?