I bought a Ps4 last, but every time I go further away from the Ps4, the controller loses the signal. Why is that?

I've already tried it with a new controller.

What does 'go further away' mean?

Are you going further away with the controller?

What does "next" mean? They may have a range of 6 meters

1-2 meters

You either go too far. Then he loses the signal. Or the BT receiver has a problem. There are more common. But I think you're just going too far with the controller

Sometimes the controller also controls itself, but as I said, it is not the controller

I walk 1-2 meters away

1-2 meters

Was that not a used console?

Yes

Then the BT chip probably has a problem. Can you repair or solder new ones. Known problem. But to make it difficult without prior knowledge…