Does the error exist on the PC and laptop at the same time?
Try to isolate the error by disconnecting some of the devices from the LAN and see if the error occurs again. Depending on the result, disconnect or reconnect additional devices.

@Sevii

What type of router do you have exactly and does the LAN not work if you plug a device directly into a LAN port on the router (i.e. without a switch in between)?

Hello @Sevii

You could have a Netzeerkloop in there.

That means you made a circle, something like that shouldn’t exist.

Greetings Lorenz

As already written above, just test with a few devices, e.g. PC and TV.
If no error occurs, you can connect additional devices.
If the LAN fails again, try with a laptop and a second AppleTV

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@Sevii wrote:

What does that mean? what causes this or how did you come up with it?

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A switching loop or bridging loop is a dangerous situation in switched computer networks (or in conjunction with multiple bridges), which in most situations leads to a complete network shutdown due to overload. In a switching loop, two network sockets on the same switch are directly connected to each other or there are two or more active connections between two switches. A switching loop completely overloads the network in several ways by constantly duplicating packets.

I’ve seen this myself once with a neighbor. He simply plugged a cable that was lying around into the switch so that it wasn’t lying around.

So you would have to check whether one of the cables leads back to the switch or the Internet box. Instead of depending on a device or if it is unnecessary.

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@Sevii wrote:

So, I have a cable that goes into a switch, which then goes into another switch

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There would only be a loop if 1 cable from the 2nd switch went back into the internet box…

But at least we now know that there are other network devices at play.

Disconnect all devices from the Internet box and then only connect a single PC via LAN and see whether the connection remains permanent.

And then step by step, individual device by individual device, always observing whether the LAN stays or “dies” after a few minutes.

Brand of the switch..???

Sounds suspiciously like a network loop to me too. This can also occur if a bridge is unintentionally installed between the LAN and WLAN. When I look through your list of network devices, the Philips Hue Bridge catches my eye - maybe start troubleshooting there.

If it isn’t, activate the Spanning Tree Protocol (STP) on the Internet box in expert mode under Network.

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Sevii wrote:

So, I have a cable that goes into a switch, which in turn goes into another switch (through a cable from the switch) (yes, I know, loss and stupid, but it’s enough) and that in turn could be the error?

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You mean something like that?

No, that shouldn’t be the problem. Because I have been using this for several years.

On Switch 1 there is a TV, an XBox, a Nintendo Switch, the UHD 4K player, an Apple TV and a gateway for smart home control. A cable goes from Switch 1 to Switch 2 in the next room.
In addition to the PC, a TV with Netflix is ​​connected to Switch 2. From Switch 2 goes to Switch 3 with a cable
A PC and an Apple TV are connected to Switch 3

If I were to go back from Switch 1, 2 or 3 with a cable to another switch or to the IB 4, then that would be a loop.

An example of a loop (the loop is created by the red cable):

Very good, then it really seems to have been a loop.

However, by activating STP you only circumvented the problem, but didn’t actually fix it. Your entire network traffic may now even run through the Hue Bridge. For stable operation, it is therefore important that you either disconnect the LAN-Anschluss on the Hue Bridge or deactivate its WLAN connection. To test whether the loop is really out, deactivate STP again. Whether you leave STP on permanently is a matter of taste. What is certain is that a home network must run stably even without STP.

PS: What exactly do you mean by “everything turned red”? All your Philips bulbs turned red, or what?

Hi @Sevii

Cool that you found the error. What do you mean by tree protocol?

P.s. If you haven’t had the new Internet box for 14 days, try returning it. Swisscom always says something about a 14-day return policy. Unless the IB3 was newer and you had a different one before, then I would keep the 3.