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This might be caused by a bug that has been addressed and fixed with 2.0.0p9: https://checkmk.com/werk/12663
It seems the livestatus is bombarded with hundreds of requests per second.

You probably might find this one:

Reading request requests from client took longer than 5s

This is caused caused by the GUI which establishes a connection with the Liveproxyd but then does not send any query.

This could indicate an overload of either the GUI or Liveproxyd.

If the werk mentioned above is the cause, this workaround might also help prior to before installing p9:

Remove all Host/Service Statistics Snapins in all dashboards, save them, and then readd re-add them.
Then reload all dashboards in the browser.

If this does not work, please open a ticket and add the ~/var/log/apache/access_log of some of the affected sites which might show much many entries like

"ajax_figure_dashlet_data"