Series stops every second?

Sl
1

I've had a problem with my TV since tonight.

It doesn't matter if I'm on Netflix / Disney + or whatever, whenever I want to watch a series, it stops every second and this loading sign appears.

Only my WLAN should actually work properly.

Everything worked perfectly on my cell phone.

My brother can watch YT without any problems and fewer devices are registered in the WLAN than usual.

Who knows what might be the cause and how I can fix it?

Me

Restart the TV box, TV, router.