WiFi Network Visibility

Before upgrading my iMac to Catalina, I had no problems accessing all of my Apple devices from any of them on my WiFi network. Since Catalina, each day (and sometimes several times a day) I have to go to System Preferences/Network/Advanced/TCP/IP and turn on Configure IPv6 by choosing Automatically. I have to do this on each device that I want to "see" on my network or else they do not show up. Some time later in the day or overnight, the setting is magically disabled and I have to go through the process of re-enabling it. It's very annoying and time consuming, and it wasn't necessary before I "upgraded" my iMac to Catalina, so I'm assuming that it has to do with that.

Has anybody else experienced this? Or does anybody who hasn't experienced this have an idea as to how to correct it?