Red dot on the variables display screen

Red dot on the variables display screen

In one of my project, I am using zenon operator scada which is communicating over ethernet with two AC-500 PM-583 PLCs in redundant configuration. I am getting red dot on variable displays sometimes for some of the variables and the communication freezes..After sometimes it comes back to normal..When i checked the same varible in codesys, there is no issue..
Is there any particular driver settings that i should do yo avoid this?
Can anyone please help me..I have factory acceptance test for my panel in two days..

This is a migrated post! Originally posted on 25.06.2019 by user VIVEK_PV. Please be aware that information can be outdated.