hmm suggests router issue to me at a guess. Is Ares using the same listening or connection ports as LW? If yes, you need to change them. You can not have two programs using same port for connection or listening.

BTW if you notice drops in speed during heavy downloading, it will most likely be due to the wireless set up. Wireless connections are unreliable for constant high speed downloading, the speed will fluctuate or worse, possibly lose connection, even possibly crash the router. This is a reknown issue in bittorrent circles.

Also, try this: Tip: Purge the Downloads Queue! (click on blue link) as you may have some fakes mixed in with your incomplete files which are flooding the connection by constantly attempting to connect. Particularly at start up which is killing the UPnP communication between the program & router to open a listening port for LW.