Internet (PC) crashes when connected to a mobile phone?

I have a problem! I downloaded an update 3 days ago during the night with my mobile phone. The next day my Internet was no longer on the PC. Or rather said it was so bad that I could not connect with Teamspeak or games. Have tried everything and lo and behold. As soon as I make the wlan on the phone it works again!

Does anyone know where it could be and how do I fix it?

Cell Phone: Huawei P20 lite, Android Version 9

PC is connected by cable

A friend said I should let it over night in the Wi-Fi, maybe it lays down. Did not work synonymous ^^

Then your phone will load something down?

The network does not itch.

Restart the router. Is the phone charging something in the background?

No, it does not was now synonymous all night with connected, if it had downloaded something, it would now probably finished.

I have already restarted routers and cellphone loads nothing down. Was now synonymous whole night connected to Internet… Should then be ready, if something was downloaded.

Then set your phone to factory settings (if your cell phone is the cause).

At least it's not clear that my phone is downloading something. Do you have any idea if I can look somewhere, if it is downloading something in the background?

Ehh.

So I can turn on my Huawei that I see the current network load (very useful for Germany's mobile to know what it is )

That is then in the upper bar. But I also know that not everyone has that.