try to reset, and do you have other power adapter, it might be the problem of the power adapter, try with a differnet power adapter, and test if you have the same issue, if yes, check if still in...

try to reset the device and reconfigure it, if the same thing ,check if it's still in warranty for Repelacmeent.

If the switch is just a plug and play switch, no special settings, there should be no problem.

Hi firend, can you post your question in Enlgish

It seems it's the APP itselft since other device is workign fine.

Hi firend, you can refer to the FAQ and check if the configuration is correct first:https://www.tp-link.com/en/faq-1862.html