Hello /wsr/
First time posting on this board greetings from /fit/

I have a simple question I have 2 wifi networks at home the first one is my own the second one is that of my gf (a shitty router but she needs to keep it for a year because of contract)

so here is my problem if I connect with my gf wifi my PC starts to slowdown and the sound is stutterin like crazy and with my wifi everything perfectly fine.

Is here router hacked or some kind of shit or has it to something with my drivers?
I am not an IT noob but i am also not really an expert so pls help would be grateful.