I just installed two Caseta in-wall dimmers, side-by-side in the same box. Both are on 3-way circuits, where I completely ignore the other end (I have not removed the switches on the other end, just don't touch them). The two circuits are the only things on the 15A breaker.
The bulbs are all the same, 8.5W approved bulbs, 4 per switch.
One switch is working as I'd expect. No problems. The other one is misbehaving in multiple ways. Primarily, if I get it to turn on, the lights flash in one second increments at any brightness. No strange readings from the switch lights. Secondly, more and more often (I've been fiddling with them for around an hour now), the troublesome switch is completely unresponsive through devices or manually operating the switch.
I'm guessing this is an issue with how I've wired them, but any tips would be greatly appreciated!