Windows [HELP] My games keep disconnecting from coop games

[Cites]

So I play the game with 1 of my friend and he is the host of the coop and sometimes my game randomly disconnect from the server. I've try many thing but nothing is working and I think it is because of the internet but my internet is better than my friend so maybe it is my friend internet problem? I still don't know but please help.

It happened only for coop. on single player the game seem normal with no issue.

help