Anyone able to use the basic function of a dependency rollup monitor for a Group With a large number of members?

To represent Exchange end user availability we have put Object of ‘Exchange 2013 service Components’ in a Group and added Performance and availability monitor to this Group. The problem is that it only displays Health state occasionally. Rest of the time it is uninitialised. I believe it has to do With the amount of Objects, in this case 2501 to be exact 🙂

Ehrnst selected answer