I know that we have discussed this in the past, and the standard response is 'line noise', but i am asking if there could be another culprit.
So with many action groups/scenes, there are devices which often, as part of the scene or trigger get the 'send failed (no acknowledgement" error. I have filterlincs all over the house and have worked on the signal noise thing quite a bit. What i have noticed is that almost all these instances are with 600W insteon modules that are physically located in boxes with more than one module (and typically, but not always in the middle. So the middle module in a box with 3 modules). Could it be because the higher wattage module is required? I recall reading that if you have a box with multiple switches, you require higher wattage modules because of the proximity/interaction of the modules. Could this be the culprit?