There are some interesting developments with Z-Wave.
Just about a week ago, SiLabs released a firmware update for 700 series controllers that supposedly fixes a massive bug.
The controller was periodically not able to transmit.
In my mind, that seems like what we causing all kinds of issues on my c-7 Hubitat. At least, I had been suspicious that it was going radio silent at inopportune times, because that would explain many of the problems.
So, fingers crossed that was it and that Hubitat is able to test it and get it rolled out.