another rum0 user
I have D-Link DWA-110 (based on rum0).
I use it as client adapter on my laptop (because on-board wifi is unsupported Atheros 5424) and i can add my little experience. Your problems is probably drivers-related, my rum0 too semi-randomly disconnects from AP. But not in "ifconfig" form (status is active and link is established) but in "dhcp" form (because i need to "sudo dhclient rum0" to fix it).
I use ifstated to automagically check (ping google.com) and fix my connection.
PS So, IMHO, buggy driver/hardware version.
PPS And sorry for my "newbie" terms, i'm total zero in networking.
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