In this moment I have exactly the same situation :(

I bought this router 4 weeks ego. I restart it in app TP-Link for Android.

In this moment I can't connect to 5ghz networ (network 2,4 ghz works ok) Scrren form: tablet - don't see 5 ghz network Samsung S9 - authorization error Sasmung S8 - don't see Laptop - don't see

I didn't check led status, I will chcek next timie. When is problem wiht wifi other devices have too.

2 weeks ago i have to go back to factory settings because: my phones or other devices lost connection with router (1. was connect but no internet, 2. problem with authorization, 2 don't see wifi...