I discovered my issue was happening due to I had a node that was not polling properly.  After I corrected the issue with the faulty node, this went away.  Recommend checking your nodes to make sure they are all polling correctly.

I am experiencing this same issue as well using Cisco Prime Infrastructure 3.4 build 3.4.0.0.348.  Latest Device Pack 3.  Same issue.  Anyone able to fix their issue with this?