Ps4 slim Does not connect to the 5GHZ network but could use it well before that, what should I do?

I have had a Ps4 slim for 2 years and also use it once a week, but since 1 week, my Playstation can no longer connect to the 5 GHZ network (position unchanged [of both]).

I started to use the 2.4 GHZ network (our router can do both), but for 2 days now I can no longer use that either, although I have a connection with other devices even at a greater distance.

I have my provider at Unitymedia and I ask you for advice on what I can do there

Maybe restart the router

I've just tried it, but unfortunately the problem remains the same.

Okay console restarted

I'm sorry I'm late, but the internet and television have been gone for 6 days.

I also restarted it several times and even rebuilt the database, but the problem still remains😓

Okay ask the Sony support

I have.

Let's see what they say

OK