Can't play Halo 3 co-op on PC, always disconnects someone

Short and simple. I haven’t been able to play Halo 3 co-op for the longest time on PC. Every other game in the collection works fine for co-op, but H3 always disconnects someone at random whenever I try to play it. The multiplayer for 3 even works fine. Anyone have any ideas?

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yeah I had this, I got it to work for a bit by switching the player who was the host but it did still disconnect after a bit but we were able to do like half the missions before the next disconnect at least

Unfortunately this has been an issue since halo 3 launched on PC, the only way I am able to stop the disconnects from happening is by having everyone in the lobby lock their framerate to 60, Halo 3 ODST suffers the same issue.