Uhm, no, I'm not the original poster, and my setup works just fine with no (zero) dropped connections, thank you. The Apple is the primary router because it handles IPv6 (which my ISP, Compost, *sort* of supports -- as in, I can ping -6 their IPv6 DNS server, but can't get beyond it to the IPv6 Internet as a whole) while the older D-Link does not. The D-Link is set up in pass-through mode with DHCP disabled, and is set up as a separate WiFi network with its own SSID since it is a Wireless G router rather than a Wireless N router and I don't want to connect to it with any device other than that LG Blu-Ray player.
The original post has only a single network and single router and his laptop keeps dropping connections. I was simply pointing out that last time I ran into that problem, it was an incompatibility between my router and the device I was attempting to attach to it, thus why I brought the D-Link out of retirement and re-configured it the way I re-configured it -- the LG had no trouble talking to the D-Link, but would not sustain a connection to the Apple, it kept dropping. No other device on my network has trouble talking to the Apple so undoubtedly it's a bug in the WiFi chip used in the LG, but that's how it works sometimes.