Community ManagerThat's probably the issue then. Wireless is unreliable and prone to disconnects/lag. Especially when the signal has to travel through walls and/or floors. This gets worse when there are other devices sharing the same connection. It's worse still when anyone is streaming media while you're playing. Until you get wired, or at a minimum, closer to the router, this will continue to happen. You can try changing the wireless channel you're using. That may help. Also, you could try opening ports. They are listed here.
You also may want to try researching powerline adaptors. Those have been a really good solution for many that are too far from the router for a wired connection.
I switched from 2ghz to 5ghz wifi and it helped, hopefully this will help others too.
