netgear 814 dropping wireless connection

I have a netgear mr814 and 3 wireless with dlink 520 all work except for 1 it has sent 2000 recieve 0. I checked the ssid it’s the same I checked to make sure no firewall is on. The signal strength on this is good to excellent. I changed card no difference. It works for awhile then this happens. The others are farther away and have no drops..I’m planning on another antennae for hers can’t figure this out.Only way to get it back is to unplug netgear wait 5 seconds plug in and it’s back for awhile…
H E L P