Gmod messes up my internet - anyone else?

Whenever I join a server on Gmod, the houses internet just dies for like 3 minutes until I am loaded into the server. Its been happening for around 6 months now and no idea what causes it. It is extremely annoying to everyone else whenever I join my server. Does anyone else have this?

Also if I do not close Gmod via the esc - quit option, the entire thing just crashes -_-

I love Gmod and my Jailbreak server. But the problems of the game its self are passing irritating at this point.