I've got a whole house of Zooz switches and dimmers. All are series 500 (ZEN21, ZEN26, ZEN27), except for two ZEN77 series 700 dimmers.
With the new Z-wave mesh graph feature, I've found myself again trying to understand why the two ZEN77 devices (Kitchen Sink and Kitchen Cabinets) for all intense purposes play poorly with the series 500 devices.
These two devices are in the same three device gang box (one outlet plus the two ZEN77 devices). This is an open floor plan, so no walls between these devices and eight or more series 500 devices within 25 feet. Adding to the strangeness is that the two ZEN77 are right next to each other, yet Kitchen Sink sees two series 500 devices and Kitchen Cabinet sees no devices???
I've done Z-Wave repair multiple times.
I guess I should try to exclude and reinclude to see if that helps.