I have installed many of these single-pole switches and rarely had any issues but today I hit a roadblock. After a tight install in a 2 gang box (only one HS200 and an existing one-way toggle), when I turned the power back on, the switch continually makes a ticking sound and the associated light it is connected to just flashes. I used wire caps on 4 wire connections and thought all were well covered. The neutral was ganged in with a bunch of wires in the back of the box (like always) and the ground had to be looped in the single ground servicing both switches. Line/Load should not back any difference. Is it a possible wiring issue or perhaps a defective switch? Is there a safety concern?