It's almost certainly a problem with your network. Do you have a mesh or any access points? Any static or reserved IPs in the network or in the router setup?

If they're flashing red (amber) they're unable to connect to your wifi. You shouldn't need to reset - does the restart button not work? Are you using APs? If so they may not be connecting where you...

Most likely the wiring isn't correct or you have a loose connection. If the switch is rebooting (you'll see it's LED flashing after turning it on) it's almost certainly the wiring. It's possible but...

If it clicks but the power doesn't shut off the relay contacts are sticking closed. You might try tapping it to see if it'll start working but that's usually only short term and you'll probably need...

If it's solid red, not flashing, you may want to try it in another outlet to see if that helps. If not it's probably defective and you may need to replace it. Generally they're pretty reliable.

I'm not so sure about that... I block my tp link devices from reaching the internet. Of course that means I don't have remote access via the TP Link cloud but that's ok 'cause I'm using...