Have you considered hardwiring [Ethernet cable] the Mesh nodes to the main router, this should boost the mesh nodes connection quality and WIFI signal strength(s)? Also the network signals are dependant on the distance of the nodes from the router, the further away the node is from the router the weaker connection quality and WIFI signal strength becomes.
Can you access the Eero configuration page [usually
http://192.168.1.1 or similar] to assess where the issue may be, it may arise you which node has the weak connection point etc?
I have the ASUS router [RT-AC86U] and use the same ASUS routers for the Mesh nodes. One of the node is hardwired directly to the router which provides an "great" connection quality and the other is "partially" hardwired via a powerline adapter which provides a "normal" connection quality.
Like you, I had a lot of issues with the Logi-Circle camera which is installed outside of my property which would drop out on many occasions. After installing a Mesh node in the garage this boost the connection quality to the camera and very rarely do I get any drop offs.