Two times now I’ve had all of my matter thread devices ( 5 ikea devices and a Aqara lock) suddenly be disconnected and require resets and re-pairing to get them back on the network. I realize EISY and the Z matter are not a thread border router but act as a bridge to the matter network. I can’t come up with any explanation for this issue, so I’m just inquiring if anyone can think of any reason the EISY could cause this kind of an error.

I have had similar experience with the single thread device with which I am experimenting. I also have similar experience with matter-over-wifi devices. I have never satisfied myself that I know the root cause. For now, I am not adding any more matter devices.