Despite 50k line and mesh system laggs while gambling PS4?

We live in a house on the bottom floor of a speedport Smart 3, one floor above a Speed Home Wi-Fi and on the top floor one more. Nevertheless, I have the gambling on the top floor an impossible game on the Playstation 4. I have almost everywhere in the house full reception. In addition, we have 2 ps4 in the house and playing with each other is not synonymous if someone joins the same server as the other he will be sacked. For many others, what is the problem with us?

Of course that is not so nice that there are the problems in the WLAN.

Are there any problems because only with the PS4 or synonymous with other devices that you use in the upper floor in the wireless?

That if one is thrown out if you gamble on the same server I've only experienced so far on the ps4. Other units on the top floor are running perfectly here have a Fire tv stick and 3 phones which are regularly connected to the top of the Wi-Fi.

How is it, if only a PS4 gambled? Is everything then stable?

Sometimes the game depends on the wireless connection. But there are whole game crashes when the two ps4 are on the same server