Missing data in the GUI serveral times every couple of hours

over the course of a day, our idera reading look like this.... I have officers in the company want this fixed as it disturbs them, if I close out idera and reopen it, then the data is there, but they want to be able to monitor the servers through out the day.... and it doesn't happen to every server that the diagnostic manager is reading... but the server you are seeing is our server we must have running right.. thank you for any insight...