@dennypage - Great work at getting to the root of the issue. Even though I do not use Z-Wave typically, I decided to compare my C8 hub's Z-wave performance using my old UTRONICS PoE splitter versus the Procet Gigabit Pt-PTC-AT PoE splitter you recommended. Both were used with a UniFi 8 PoE 60W switch.
While Z-Wave, connected to a single GE Switch, worked with both, the old UTONICS caused some small, random delays between the hub sending the command, and the switch acting upon it. With the Procet splitter, the results were consistently quick and reliable.
Just another data point! Thank you for the extensive testing and for publishing your findings!
