C3700-100NAS Drops Connections and Glitchy

I could never get the C3700 to work with my PC/Network in Northern Virginia. Both Network and Cox said it was compatible with Cox. Numerous calls and chats with Netgear and Cox, as well as multiple forum posts and internet searches, resulted in no improvement in stopping the dropped wireless connection issues or my unstable game play. I fiddled with many adjustments. I most recently tried to reserve an IP address and had Cox come out and check the lines. Neither made any difference. I am not PC/Network literate, but I think it might have had something to do with the up channel. The light kept blinking, but both Netgear and Cox said it was not a problem. Cox did say they had had some problems with modem-router combos (he did not single out the C3700). I bought the C3700 at Staples and they won't take it back after 14 days, it was a Christmas present bought 14 days before Christmas, so I have an expensive paper weight. I have gone back and am using my old DOCSIS 2.0 modem and Dlink router and everything is working fine again. Trying to upgrade to Docsis 3.0 has so far been a total waste of time and money. I am sorry I bought the Netgear C3700.