ZeDoQueijo

OK,
I'll wait to confirm if the cable change and the settings you recommended will take effect. I will do this process as a last resort.
Thank you very much.

Yes friend.
I already changed the network cable several times, I changed it for injected cables.

As I make the IP reservation in DHCP I leave the Playstatio with automatic IP configuration.
I will configure the IP on the Playstation manually and do the tests.

Good morning Liam, For the third problem I managed to solve it the way you suggested, I added my friends and the connection was allowed. It just took a little while to replicate the settings, but so far so good. Thank you very much.

Okay Fraser,
I had not thought about this possibility, I understood that the IP reserved for the equipment should be within the range 2 - 50 as defined in my router.
I'll do the tests today and give you a feedeback.