I recently upgraded to AT&T U-Verse and I get pretty good internet, the modem however is crap. Just absolute garbage. The AT&T rep told me it was only designed to support one device at a time, but my house has more than 10 on at any given time. The internet keeps dropping. What sort of modem can i get to midigate this? My old netgear dual band ADSL2+ won't work.