Laptop automatically disconnects?

I've had quite a problem with my laptop for 3 days.

It disconnects itself from the Internet every 15 minutes (approx.).

At first I thought I had pressed any button, but the button to suppress the WLAN is far away. I could never accidentally run in my life.

The problem occurred all of a sudden and at the moment it seems as if it doesn't want to go away anymore.

I have already reinstalled my WLAN network adapter and also deactivated and reactivated it.

The drivers are all up to date.

I have no idea what that could be and it's getting really annoying.

First look for the problem at the root, in the router.

Do you have a fritzbox with Wi-Fi guest access? Do you use that

See if it is limited in time.

I took the Rooter off the net for a minute and then put it back in.

Nothing!

The problem is only with my laptop because other devices remain on the network.

But what could it have?

Now I was recommended a LAN cable but I think that's nonsense. Because everything was always possible with the connection and also the wall that I would have to pierce is 5 meters thick!

Maybe this can help you a little