My WNDR3400v3 loses up to 65 percent of signal strength

[themover1]

My WNDR3400v3 with the latest firmware loses from 60 to 65 per cent of my cable signal,  I have wired directly to the modem and get 60 dpms

using my router I get from 18 to 24, and sometimes lower. I am running 2 windows laptops, an iphone and an ipad{never all at the same time},

and the output is not good.  Is this common for this router, and is there a fix or do I just need to get a better router?

[TheEther]

You haven't told us how your router is configured, especially the wireless settings.  Have you tried changing Wi-Fi channels?  Is Internet Access QoS enabled?  Is WMM enabled?  Are you using WPA2 security?

Do you have anything that could disrupt the Wi-Fi signal?  Cordless phones, baby monitors, thick walls?