i had same problem
i returned my wndr3700 last month.and got a draytek 2920n i know its a bit more and maybe i'm crazy,but i,m using this with a alienware m17x and the speed/stabilty is hard to beat.
asus rt-n56u
i have been checking this site for review on this every day.this router has been listed on newegg for 2 weeks and still no reviews there as well.
i have the netgear wndr-3700 which i use for gaming (cod2/4} and have had no problems-but if you need a dgl-4300 -i have a new never used one u can have for $50.00