[CA] [CA11] E120 Master/Slave issues

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Currently have two 9 year old E120 displays that are networked together. I have one set to master. Don't know a way to set the other to slave, but it is not set to master. Frequently, I get a message on the non-master unit that data is missing and the unit needs to be set as master. If I turn the unit off and then on again, the alarm goes away and I usually don't see it for the rest of the day. This issue has only surfaced in the last year, as previously, I did not get these alarms. I've tried resetting both units and starting all over again, but in a day or two, I get the alarm again. I've also tried starting the master first and allowing it to completely settle before starting the second unit, but that doesn't seem to make a difference.

Is there a way to set the second unit to Slave? Is it possible to just set both units to Master?