Hello. I recent installed five S515 3 Way Smart Switches (along with many other S505 single pole switches throughout my house). Two of them work fine, but the other three have pretty much the same issue: after turning the power back on, the light the switch controls keep flickering, about once per second, and the LED on the switch itself blinks the amber color. I've tried every wiring combination I can think of, and none of them work. If it makes a difference, one of them is in a two gang box with an S505 (which works) and the other two are in a three gang box with a S505 and another S515 each (which all work).

On a related note, I swapped a couple of the wires around so that they would work as single pole switches, and they seem to work in that configuration, but one thing I noticed is that in one of the three gang boxes, the S515 that was giving me issues seems to go offline and back online, every few seconds or so. The LED, which is supposed to be solid white, turns off, and the switch doesn't respond remotely in that state, and then shortly after the LED turns back on and the switch is responsive again. 

So, what's going on? Are they not drawing enough power or something? I contacted an electrician, but he didn't seem to have the answer. Can anyone here help? I can answer questions as needed. Thanks.