Have the same issue playing with my son on the same network. Been playing without issues since TTK landed and suddenly we are experiencing problems with lag and even joining each other's fireteam. All this resulted in my son getting a one week ban from crucible for "unstable connection" after the last Iron Banner....
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That's ridiculous... A suspension for something that's not his or yours fault. They should just give a warning before that your net is unstable and players have been reporting it