1. Delete LW prefs folder whilst LW is closed; Deleting LW Preferences folder in OSX.

2. (a) Problems with the search, __ (b) Hostiles List

3. Disable all options under LW prefs/options > Advanced > Performance. See if that helps. If not, see 4.

4. Lower upload & download speeds slightly.

Wireless devices do struggle with heavy downloading ... resulting in unreliable speeds, p2p connection issues sometimes & the router struggling. This is not necessarily your problem but something to be aware of. Have you considered port forwarding? It's generally more reliable than UPnP for most devices ... particularly for Belkin in my experience on this forum. To Port forward you first need to set up a static ip.

Sorry for my late response.