My home route is a D-Link DIR-890L. Since the beginning on acquiring the SP4, I noticed wireless speed to be rather slow, and later discovered that the onboard Marvell AVASTAR Wireless-AC Network Controller connects to the router using 802.11n. I could only acquire 802.11ac connection if I forced the wireless adapter to only communicate on 5Ghz band. Since that worked I quickly forgot about it. When outdoors I typically carry a 3G Wifi modem to provide Internet connection to my mobile devices that don't have their own SIM card. Today I so happened to carry the SP4 out into the wild, and was troubled to find it not being able to connect to my 3G modem. Some hours later, I remembered the band setting, and revert back to Auto so that it could communicate on the 2.4Ghz band. Of course, that means on reaching home, it talks to my router on 2.4Ghz (802.11n) again. Yes, I can reconfigure settings according to the scenario, but I'd really love the wireless adapter to realise on its own there's a better protocol/bandwidth option available. What can I do to investigate further why the SP4's adapter prefers 802.11n?