Mike, it's me again (Kathy). I'm going to give you a link. Click on it and post your question again - the more detail the better - a photo would be great if you can. Because of the lack of responses, I know that people are not seeing your question. I agree you need help. I'm thinking it might be crown rot. Let's see what the others think?
Kathy

Here is a link that might be useful: Mike Click Here and Post Your Question Again

If these are established clumps and you are excessively dry they could be going dormant due to drought stress. They should come back out when they get some moisture.

Janet