Initializing xiki occasionally and system becomes unresponsive

Hi,

We just setup our xwiki server and we found that the “initializing xwiki” process runs not only when the server is just started but sometimes even when the server has been running for a period of time. When the “initializing xwiki” runs, CPU spikes and the service becomes unresponsive. Is this normal? Where I should check to see why this is happening?

Thanks,
Silva