One of the challenges we faced this week was a high CPU usage on one of our SSAS Cluster boxes when there was very little activity, plus some errors in the event viewer being logged repeatedly:

We escalated it to the documentation team* and found a KB article on Microsoft. Be warned though, we did have to restart the server in order for this hotfix to apply. But it fixed our problem.

http://support.microsoft.com/kb/2793634