Cant play online with roomate(STEAM)

I wrote a ticket regarding this issue to support almost a week ago and have gotten no response. Hoping that posting here might be more fruitfull.

My roommate and I both have pc’s hooked up via Ethernet to the same modem.

Every time we try and match make together one of us gets kicked out of the game just before it starts.

When we tried matchmaking a firefight, something pretty strange happened. Player 1 would have a black screen and Player 2 would jump in the match as normal. Then after a few seconds Player 1’s screen would go black and Player 2 would be able to play. It would keep switching back and forth until one of us disconnected.

We can both play online, at the same time, as long as we are in separate matches.

Has anyone else had this same problem? Does anyone have a solution?