@Solla-topee 

Hello, I recently had some problems using my ASUS router. In this case, it was only affecting the 5GHz network, and since the camera does not use this network, I figured that this should not be the problem. In any case, I have already installed a new router (TP-Link EX220V2) and so far the camera is responsive, and the LED is always green. I will continue monitoring it in the following days to see if the problem returns.

That said, just to answer your questions:

1. I had already seen these instructions, and I did everything that applied to my previous router, but nothing solved the problem

2. No, when the LED was red, most of the time I could access the camera even when I was outside my local network, using the Tapo app

3.1. My old router was an ASUS RT-AC59U, fully updated with the manufacturer. My network is simple: a Nokia modem connected to the fiber optic, and in one of its ethernet ports the RT-AC59U was connected, to this router I connected to the WAN port. All my devices, wi-fi or not, were connected to the ASUS. Currently my new router (EX220V2) has exactly the same configuration.
3.2. The problem occurred at least once a week, and often a few hours AFTER the camera was rebooted.
3.3 Currently, with the new router, the value is -42
3.4 I was unable to do this test and now that I am using the new router, I have not needed to.

  @Carlos_Filho  did you get a response abou the connection lost.i have the same ptoblem.. om top of that i 've lost the configurstion of the tapo software