Fortnite lies / hangs?

As I said fortnite hangs more often for a few seconds (only in duo mode in solo mode everything runs smoothly) is then possible but neither shooting nor building is possible. What could be the reason why the internet connection is stable and there's no update available. I have already tried closing and reopening the game

Maybe the hardware is no longer enough and you have to lower the settings. Give it a try.

Possibly hardware too weak.

Up-to-date graphics card driver?

I'm currently fighting for every fps (despite new hardware)