I Play DayZ with my brother with the same internet connection, same router. When we are a few minutes in the server list, looking for a server to join, the internet connection crash.
We have a lot of bandwidth (60MB down, 6 up) and doesn't occur to us with any other online game. I have friends who have the same problem of loss of connection.
Only happens when we look for a server. While we play dayz not have any problem.