This is a known issue with the Killer adapters. Apparently they're testing a beta driver right now to fix it, and it's been given out to a select few people (not me).
Anyway, to fix this issue there are a few things that have been suggested to me by other Alienware owners:
1. Uninstall the Killer Suite from windows. Download the bare drivers from their website: http://www.killernetworking.com/driver-downloads/category/other-downloads Chose the 64 bit version. You'll have to download it and extract it into a folder. Then open your Device Manager, right click on the "Killer Wireless-n/a/ac 1535 Wireless Network Adapter", click on properties. Select the driver tab, click on Update Driver, select "Browse my computer for driver software", and then point it to the folder where you extracted the driver to. Windows will install the driver you selected. Restart the computer. Once it's restarted, go back into Device Manager, "Killer Wireless-n/a/ac 1535 Wireless Network Adapter", select the Advanced tab, under preferred band select either 5ghz or 2.4ghz (whichever one you would prefer to use), and then under Roaming Aggressiveness, set it to Lowest. Click OK.
The above worked for me 100%. I have not had a single dropped connection since doing that. Hopefully the new drivers will be available soon for our systems.