Ed:
Nothing has changed since I upgraded to the 720; router is always in the same spot, about five feet away. Have no problems with laptops and printers running off it at a much further distance.
The 720 seems to be always hunting, even after it reports that it is connected; there were about five other SSIDs showing, all in locked status, but continuing to cycle(?). After the final connection was made yesterday, the download went well.
If there was a way to select and "lock" the conection I want to use, I believe this problem would go away.