PC [HELP] Co Op keeps disconnecting.


So i;ve just started playing stardew with my brother, we live in the same house and use Ethernet cables connected to the router to play. The first 2 sessions we played we had no connection errors or anything but over the past two days we aren't able to stay in the same match together for long. As soon as he joins our discord starts lagging and eventually just disconnects and kicks me out and shows the connecting message. This also makes my steam friends list disconnect and i am unable to sign in for a while. I'm not sure why this happens if the first few times playing we never had any connection problems or discord crashes. Any help would be appreciated!