Summary of requests (with a focus on z-wave)

Didn’t know that. I’ve been assuming it shares 2.4 GHz space.

I think found a hint what can be a problem with the zWave instability.
All S0 joined devices are OK and do not hang (at least 2-3days now).
All which are joined as S2 (Qubino 16A in my case) bugged in random moments (some work for a day or two with no problem) and when replug start working again.
How it can be troubleshooted? Is it a Qubino problem (though didnt have such prob when were paired with ST hub for years)?