Can't seem to add my Monster Cable IWD600S (Leviton) switch?

Hi there,

Anyone out there have a Monster Cable IWD600S connected to there hub? I have had several on my account and they have worked for years. Lately they say “Disconnected” and drop off. I have tried to reset them, rebuild my Z Wave “hops” and even completely reset. I now have switches that I can seem to add back? This switch is actually built by Leviton and could be considered a RZCZ1-1LX. I regret removing them now… I sometime will get one added back but then when I try to use it I get a “network error” message.

Cheers
Jim