@PizzaNinja Sounds like a neutral wire problem, could be your white isn't neutral or you had a loose connection. I've also see the occasional wiring error where someone splits the white bundle to add...

@seanmckeownyoun If the new unit didn't work that pretty much narrows it down to a wiring problem. Very likely the wires aren't doing what you think - often white is NOT neutral in switch boxes. Did...

@Smartswitches It's an electrical code violation to connect a neutral wire to ground. It'd be safer to use a smart switch that supports installations where there is no neutral wire.

@Stevieruss "buy a Tapo one". That'll certainly eliminate the problem - tapo devices are cloud only and don't have a local control API. So if it's really a network problem you'll lose control of them...

@Bytez Could be they have weaker wifi radios if they're a different version, or have trouble due to their location, or sometimes they may be connecting to the wrong AP if you have multiple. You...

@Cstroud I'm not sure why it works (and it doesn't always), sometimes it's that the router is leaking resources/connections and needs an occasional restart when it misbehaves. It might also be that...