NetGear WNDR3700v4 N600 router issue
I'm no techie but this is what I think I know; I'm getting very reduced network speed, a very weak signal and it seems like there is a problem staying connected. I have isolated the problem to my router. I'm paying Time Warner for 20Mbps download and 2Mbps upload speeds. My downlands are running between sub-1 and about 10Mbps with the majority of measurements in the 2 to 4Mbps range. When I connect by wire (5e cable) to my modem I get near 20, when I connect to my router by wire I get near 20. When I connect to my router with Wi-Fi I have the problems. I've run Speedtest from an old HP Vista pentium laptop, from a Dell Win7 i7 desktop and from a Toshiba Win8 A4 laptop all with the same results. My router placement is not ideal, however, I moved from MA to NC with a WNDR3700v1 or 2 and had no reason to complain and never cared about testing speed. I lost the router to a nearby lightning strike and replaced the router with the updated version of the damaged model. That's when the problems started. I've talked to NetGear and tweaked settings 5 times which has left me with the occasional 10Mbps download. Upload speeds have been pretty consistent at just under 2. After the 5th conversation, NetGear sent a replacement router. It performed worse than the first and a second replacement performed worse than that. I've also talked with Time Warner and they haven't been able to offer anything. I did try a new modem that was useless. So now that I've exhausted all of the amateur advisers I've come to the experts for help.
Any ideas why a newer model of a decent router would behave much worse that an older model of this same router? I am using the latest firmware and have been during all of my speed testing. Do I bite-the-bullet and try different brand?