I was having the same problem. i simply opened device manager and selected the wireless card. i then selected update device driver, select look for it manually. then select look for the existing driver uncheck find only compatible driver , select dell from the list and the driver that worked great for me was the dell 1702. hasnt dropped since. good luck. 
Hi... i have a serious problem with my internet connection while using WiFi when i ever try to connect to my network it's works fine no problems at all but after a few minutes it's just auto disconnecting and i have to reconnect again i don't know why i tried to change the version of my windows with fully formated drive but it's not helping and i also tried to replace the network driver with 1704 but it's not helping ether and i am currently running on windows 8 with the latest network driver (Dell Wireless 1705 WiFi + Bluetooth) and my laptop is Dell 3537 please anyone help me i can't play any online games or do anything on the internet
Dell Wireless 1705 Bug !!! *NOT FIXED YET