Plesk Service Stopping & Starting

[marco114]

I have Plesk 8.1 running on CentOS 4.4 Linux. The server has been just great for months. In the past couple days, the interface has been sluggish and I noticed that Plesk is actually quitting and restarting itself (watchdog notifications). Is there any logs or debug modes I can use to see what's happening? It's very hard to get anything done as it will work for about 5 minutes and then stop again for a couple minutes.

When I don't touch the server, Plesk doesn't restart at all. Also, none the the sites that Plesk is hosting are affected, it's only Plesk itself.

Thanks a bunch.
Marc