I have cable internet advertised as 20 - 30 Mbps, and a Surfboard SB6120 modem. When I plug directly into the modem, I get around 28 Mbps and am very happy with that. When I go into the Airport Express however, it slows to around 8 Mbps. The airport express is from 2009. I have tried changing it to only 802.11n (have trieed both 2.4 and 5 ghz options), and have tried changing the channel, but nothing seems to help. Is there a way to get it back up to around 28 Mbps, or do I need a new router? Thanks!