First time I pressed the button on the NodOn, nothing happens. Second time I press the button, it takes almost 4 seconds before the light goes on. See youtube; https://www.youtube.com/watch?v=-_z9rXRE9W4
In groups and network I have confirued the NodOn's like so;

I'm starting to call the remotes 'not on' because they have never worked properly. I expect them to work properly because they where not cheap.
-I have this problem since the beginning, it never worked properly.
-I've replace the battery of the NodOn for a-brand batteries
-I have a big zwave network (64 devices).
-Everything feels slowly somethimes, specially when controlling devices via Group relations.
-Some times it takes a montion sensor a few seconds to turn on the light.
-Using the domoticz interface it reacts very quickly, almost directly.
Any tips are welcome!