Right now I only have the two way setup directly on the RS 4856 Bus. I was losing my Burg 6020 devices. I just recently found a bad termination pin J3 main board (no continuity between the pins. A little wire at the top bridges the pin and that was broken. I have successfully powered off the unit and all smokes, PIR's and Burglar are normal after several power downs..
Interesting what you state about the M1XRF2H I never noticed it over 3 years having to reset 12 devices after a power is down. Thanks for that update.