Why can't my Samsung TV access the internet despite a stable internet connection?

I recently bought a Samsung TV and connected it to my Wi-Fi. Everything worked out great. Shortly after I bought the new Samsung television, I also swapped my old router for a Fritzbox. Now, about 4 weeks later, I wanted to watch something on Disney + again and it no longer works. No matter which application I want to open. Netflix, Disney +, Amazon Prime Video. Nothing works anymore. I can hardly imagine that this is due to the new router.

Can anyone help me?

I can hardly imagine that this is due to the new router.

You have to tell your Smart TV that, stupid TV!